Under 48 hours until my first appointment (outcall).  Any recommendations on things to do that a newbie like me may look over, forget or not know to do?

take a long hot shower..use a little cologne..just RELAX..providers have that sixth sense..they instinctively know a newbie from a veteran..do not be overly aggressive..let her guide you..they know exactly what to do and exactly how to do it..once you have that initial experience under your belt..you do not have to worry about forgetting things or not knowing what to do..it just comes naturally..good luck and enjoy..

the envelope, or you will be SOL.

Scent of a freshly showered gentleman with a hint of soap is good.

Strong scent of cologne - not good, just like you wouldn't want her to come in with a strong perfume scent, she doesnt want you to be strong scented either.

If she is open to it, bring a bottle of wine or her favorite drink and the two of you can share a drink together as you get to feeling more comfortable.

Thanks Naomi.  Is it appropriate to email her ahead of time to ask for her dring of choice or should I bring several options, all unopened of course.

Not a good idea to show up with a bunch of drinks, you're not there to get loaded, you're there to get laid.  From what I have read, many ladies , if they imbibe in alcohol, prefer some kind of wine.  Sometimes you can find out that info in her reviews w/o having to ask.

My date today prefers a particular wine, so I bought a bottle.  What I didn't know is if she prefers it chilled or room temp, so I did ask that.  Don't want to show up with a cold bottle if she likes it room temp, or vice versa.  Besides, I know little about wine, so it's important to know how she likes it.

Relax and enjoy, the previous posters gave you some good advice.  Make sure you are squeaky clean EVERYWHERE.  Don't forget to brush your teeth too, duhhh.

Swim

and make sure you use good anti perspirant/deodorant since you may be a little nervous you don't want to start up a new smell...

All advice you got is good, I would only add that you make sure you have read her website and reviews thoroughly where you know what she does and doesn't like, that is very important. Then treat her as you would any other girl you were spending time with, simply be a gentlemen.

just like when you bought it. Ladies sometimes freak out if they suspect their drink was tampered with.

^^ Definitely agree with keystonekid, as a provider I only feel comfortable accepting sealed drinks

That is a must.  Never offer a drink to a provider from an unsealed bottle.  Just not a good idea.  
Thanks for the reminder.

Swim