If it's a provider you have seen before, I see no reason for you to be 30 minutes early, you should know where she is by now.  A new-to-you provider, I would not contact her, reason being she might have a date before you and/or be in the process of prepping for you.  Leave it to her to let you know if it's ok to come early.  If you are more than 5 minutes early and you have seen her a few times, it's probably OK to text or call her and give her the opportunity to invite you in early.  At the same time, let her know you have no problem waiting until the scheduled time, if it's not convenient to start early.

IMHO, more than 5 minutes early is too much.  I don't think many providers would mind 5 minutes or less.  Again, you have no idea what she is doing prior to meeting you.  I try to time my arrival pretty close to the appointed time, and sometimes it means driving around for a few minutes.  Because of where I live and the driving distance/time/traffic I have to deal with, this happens.  I don't want to inconvenience the provider by arriving too early.  I have never arrived more than 10 minutes or so early, what I worry about more is getting there late due to traffic.

Swim

I'm likely to be annoyed because I may still be getting ready.  I'm NEVER late getting ready, but don't expect me to be early either!

And probably my BIGGEST pet peeve is the guys who call when they're on their way, and they want to chat to build some rapport or set up the fantasy ahead of time.  I don't understand why they don't understand that I'm trying to get ready for the date, and them calling me is preventing that!  

I also arrive early when possible and do as you do. If its a new provider I wait and communicate right on time. With repeats it depends on the provider. With one lady I can  easily say do you want to move it up and she will let me know if that works or not. With another I just text and say I am in the area when your ready sometimes she is sometimes I just wait. The text is only to let her know that I will be on time for sure. Also I usually hold off the text until closer to 15 minutes to the appointed time. The idea being is not to put pressure on them to start early but just to know there will be no travel delays causing me to be late. Usually my regulars will let me know ahead of time if they have things pressing them right after our scheduled time and then I take that as a sign that they might like to start earlier and so I let them know. Also I only do this with ladies who use text for final communication, that way if she's busy getting ready she is free to ignore it, where as a phone call I feel is more disruptive and requires an answer that may put her on the spot.

I simply ignore any calls or messages that are more than 5 minutes early.
Why?
1. I need time to get ready.
2. Some guys assume that they can arrive 10-15 minutes early and stay until the original end of appointment, thereby adding an extra 10-15 minutes to it. I am not comfortable with pointing that out to them, I'd rather meet on time and have them leave on time, knowing that I have another appointment scheduled after them.

I've had some disasters on both counts...  it is much better to plan to arrive 30 minutes in advance.  I locate the call point then with draw to the corner coffee shop & relax.  I am careful to note how long it takes to return.  With a repeat visit, I often call from the coffee...  one time the lady, checked out her window & said "I don't see you".  I could see the entrance but I was not there...  I told the truth and scooted across the street.  But it might have back fired as her suspicions were raised.  
Only with an ATF do I...  and with her permission...  do I let her know if I arrive more than 5 minutes early.  (It is a long drive & I know I am the only one she's likely to see that day.  5 year favs get some perks.)
H

Arriving early is fine but I would never call or text more than 5 minutes before your scheduled time. Providers work on a schedule and you don't really want to mess with their plan.

Also, if you are early don't hang out in the parking lot or the lobby.  Years ago I was sitting in the parking lot of the hotel where my ATF was staying.  I was early and just listening to the radio for a bit.  I got a text message at about ten minutes before my scheduled time that said "Peekaboo, I see you. Come on up!" It was cute and made me laugh at the time but it also made me realize that if my ATF could see me sitting in the lot so could hotel security cameras...

I arrived right on time, made the call & got out of my car & headed up the walk just in time to be "hairy eyeballed" throughly by the cop in the Black & White cruising the lot.  I mentioned it to the young lady in question who told me that the hotel had stepped up Security & asked for more Police Patrols as there had been thefts from customer's vehicles.  Sitting in a car, in a hotel lot, not going in...  ie "Loitering"...  would likely get unwanted attention from Hotel Security or LE or both.  Had I been sitting in the car killing time, I'd certainly have been questioned by LE.  
Arrive, make the call & go in.  If the lady is not ready, I'd not "sit", I'd drive around the block or something.      

On another occasion I was on my way to see a Fav Lady...  I was on the Interstate when the sky opened up.  It was about impossible to see, the rain was coming down faster than it could run off & there was serious danger of hydroplaning.  I tried to keep going (horny toad that I was).  Finally the traffic came to a standstill.  100% stopped.  I was in the "high speed" lane...  going no where!!  If I'd had an extra 1/2 hour I might have made  it...  There was no chance.  I was still 25 miles to go when I should have been there.  I finally got through to her (she'd been in the shower).  I managed to get free a few days later & we made up for lost time.  

These were the most infleuntial in shaping my plans...  there have been other instances which confirmed the wisdom of this plan.  
H

I always try to allow plenty of travel time.  With traffic and road construction there are regularly delays along the route.  Then I also worry about not being able to find the place in time as well.  If I am running really early then I do a drive by the location to make sure I've got it and then find somewhere to kill the time.  There is usually something nearby like a mall, bookstore, coffee shop, whatever.  

I try to stick close the agreed appointment time since in my experience the girl is usually getting ready beforehand and has her routine and such that I don't really want to interrupt.  I try to time my arrival to a few minutes or so early and then give her a call.  Usually they pick right up and soon I'm knocking on her door right on or pretty close to the scheduled time.  

Now with the fav provider its a little different.  If I'm running way early I'll call and let her know and she'll either call or text back unless she's busy.  Sometimes she'll just text me back the room number and tell me to come on up when I get there.  It just depends on what she has going on.  It is different with a favorite provider though.

sometimes I will ask the provider ahead of time if it's OK if I contact her should I get there a bit early.  Sometimes she's OK with that sometimes not.  If it's a matter of 10-20 minutes I'll just accept that it's part of the game.  I use public transportation for many of my appts. in the city so it's never possible to arrive at the exact time; plus I hate being late for an appt. (don't think I ever have been) so I usually just chalk it up to part of the process if I have to hang around for a while.  I try to find a coffee shop or a bookstore where it's not unusual to have folks just hanging around.  If I'm more in the suburbs, I'll park away from everythng active and sit in my car 'checking my e-mail on my phone' so as to not arouse interest.  If it's a real big hotel with a big & active lobby & it's only about 10 minutes or so, I might sit in the lobby checking my e-mail.  It's only a problem when it's freezing cold our pouring down rain & there's no real good place to hang out (has happened once or twice).  Of course this all gets a bit more problematic if I get the 'Give me 10 minutes' response, but it's all part of the game.

It's best to be a little early rather then coming late....

MA

Most providers do not have waiting rooms like your doctors office.  Being early might mean she is still brushing her teeth or lighting candles, or simply taking a few personal minutes after preparing to set herself in a fabulous mental state so that she can be fully present with you.  Maybe she needs that time to make a quick call to the babysitter or check in on her car getting it's oil changed.

Early is early.  If you text telling her you are in the area, and and she says that she is not ready (30 minutes before your visit!), then why is showing up 5 minutes early ok?  I am sure if it was she would send you a text back telling you when she is ready.  Just try to be on time unless she gives you the green light.

.02

to a local store and browse around, until time to go to the incall situation.  If the incall is a larger business hotel, there is nothing wrong with sitting off to the side of the lobby or near the hotel meeting rooms and reading a newspaper until it is time to go up to her room.  The key is to look like you belong; blend in.

I like when guys are right on time. Anything more than 5min early and I'm not entirely ready and I might be a little upset.

If you are meeting a provider for the first time stick to the time you agreed on. If you get there early on the second meeting you can call/text her to say you are early, but don't be offended if she says to wait.

I have my 'get ready' routine down to a science. I know exactly how much time it takes me to shower,dry my hair,get dressed,and then make sure everything is tidy and the party favors are out.