Here's what I did to overcome it:

Arrive about fifteen minutes early, then get out and take a brisk fifteen minute walk.

The exercise burns up the nervous energy and actually leaves you feeling more energized in a good way.

It gives your mind a chance to clear up and get your thoughts to rest for a while.

A tantric provider turned me on that one.  I still do it every now and then just for the heck of it, and I feel better afterwards.

Try it and see.

New meetings pretty much nerves...  
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Not really a newbie here - I've seen providers sporadically over the years, more off than on.  Before I see a provider, I get very nervous beforehand, even if I have seen her before. Nervous to the point that I can hear my heart pounding and my mouth gets very dry. Once we begin, I start to relax, but it can take awhile. I'm sure much of this is normal, but was wondering if some of the veterans have any tricks to deal with this, or does the nervousness just go away with enough experience?

That's the appeal for me of seeing girls I've been with before: I'm comfortable with them, plus I don't have to go through the whole due diligence thing again.

New girls, though? Yeah, I get a bit nervous. I've emailed them and spoken with them, but since I've never seen them in person, I'm not sure how things will work out. How nice is she? Does she have good conversational skills? (I'm bigger on this one than many others are.) Will we click, or will it be a hurry-up-get-done-get-out thing? All sorts of unknowns dealing with a new gal (which must be amplified a thousand times for them, seeing new guys all the time!), enough to make me a bit jittery. But all of that goes away if we click and a nice, enjoyable session follows. They then become someone who I'll see again, which takes care of the nervousness, so it's an interesting cycle.

...I do get nervous, even with someone I've seen before but it's more like nervous anticipation.  It's the edginess of knowing in just a few short minutes I will have my face (and other sensitive parts) buried somewhere delightful.  What could possibly be wrong with that???

I deal with the same problem. But if the girl knows how to break the ice with me then it is okay. I have had anxiety issues since I was a kid so I am jumping out of my skin on a regular basis anyway. When a provider opens the door and we first meet I seem to relax once we sit down and start chatting. I am good at telling jokes so if I can make her laugh I feel good. When I do public speaking I do the same thing, if I can get a crowd to laugh it calms my nerves.

I prefer to do incall, so I stop for a bottled water at a convenience store on the way to the lady's incall. That takes care of my dry  mouth.  I always put the cross streets or if the ladies gives me the name of the hotel, I can usually google the hotel name and get the exact address. Than I put the info into my gps so I don't have to worry about how to get to the ladies incall and I also get an idea of how long it will take me to get to the incall. That's always a stress reliever. I always try and arrive early. I try and get a feel for the area and then if I need to kill sometime before the date I'll leave the area and hang at a coffee shop or a convenience store.  Finally, if  I've  done really good research on the escort, that also reduces the nerves. However, every once in awhile when I feel like taking a walk on the wild side.  and decide to toftt, the nerves are off the chart.

The combination of nerves and dry mouth get me even more anxious which just snowballs into messing with me worrying about performance and, on one occasion, prevented me from even getting it up.
All I could think was how much better it would have been if it could have been a two week appointment so we could get to know each together, with our first "tryst" on our second or third date.

Sounds silly, but I mean it. I still struggle with the whole concept of shaking hands, doing small chit-chat and then jumping into something intensely intimate. I envy guys with enough dough to book week or month long trips to tropical spots. In the absence of a real GF, that must be great.

Viagra and a bottle of water on the way there... that's one less thing to worry about.

As far as the other nervous... me too! I'm really only nervous about LE though, anything else I can deal with if it were to come up. It's hard to see what you're talking about with repeat encounters though. I've actually gone through the nervous thing earlier in a day while looking for a new provider, and sometimes my nerves get the best of me and I'll repeat which for me takes any pre-meeting stress out of the equation.

Also, as time and the number of new adventures are adding up, the stress is less and less.

Just take a deep breath if that helps as you approach her door.  If you have dry mouth, try a breath mint...that should alleviate that problem.  I have come to regard nerves as part of the experience, as well as their alleviation as the meeting gets underway.   Once you see her clothes start coming off...

... in... hold... out. In... hold... out. Repeat a few times.

Tense your body... Hold... Relax. Repeat.

Tense the lower part of your body... Hold... Relax.

Now the upper part... Hold... Relax.

Repeat.

Breath mints or chewing gum help with dry mouth. Be sure to dispose of your gum properly. Don't be a litterbug.

That's how cheapskates like me get gum without paying for it.

I enjoy the feeling of anticipation.  The nervous jitters and pounding heart.  I like to workout at the gym either at lunchtime or right before the appointed hr.  That gets me all pumped up and ready to enjoy the session.

It's good to see that I am normal and that others, with much more experience than me in the hobby, also get the jitters. For me it happens as I get to the door.  Kudos to the women that I have seen - each has found the key to making me  feel relaxed and comfortable within the first few minutes of our being together. I recall  one lovely young woman who  immediately saw my nervousness, took my hand, which for some reason was actually shaking, warmly smiled, gave me a light kiss on the cheek and assured me that there was nothing to be nervous about. We sat down to talk and I was fine...and so was what followed  The most relaxed time I have had was with a provider who insists on meeting her clients for drinks first.  I was not nervous at all entering the bar and after having a few drinks, and establishing the relationship and comfort, we then proceeding together to her incall and I was totally at ease.  I like the idea of a walk first  - I am definitively going to try that next time.