Take a shower - brush your teeth - comb your hair - wear clean clothes - Look good, smell good, be good and all will go well, at least if you selected one that was well reveiwed.

Do everthing slipry said and hopefully you picked a good provider. My first wasn't very good, gorgeous young Italian girl with a known agency from Florida, she wasn't with them very long. Being nervous and not quite knowing what to expect, a very rushed BBBJ and HJ was all I got.

Can I tag along?

I like to watch.

Just prepare the way you would for a real hot date.
I find that being squeaky clean, a dab of expensive cologne, and nice clothing makes me feel like a million bucks and the girl appreciates the effort.
Then be a gentleman.  She'll take over from there.
If you're like me, you'll be pretty nervous..but a good provider will know this and make you feel at home in no time.  Even mentioning it's your first trip wouldn't be a bad idea - she'll respect your honesty and will go out of her way to make you happy.
Have a good time, and let us know how it works out.

I was tremendously nervous the first time, so I know exactly how you feel. Since I had told the provider it was my first time with an escort, she understood.

You could suggest sitting and chatting a bit, perhaps with a something to drink. This will relax you and you'll feel more at ease with her.

Follow the normal procedures: white envelope, don't talk about any explicit - at least not in the beginning, if she suggests you "get comfortable" disrobe imediately as it lets her know you're unlikely to be LE.

Be a gentleman.

Enjoy yourself!

Tell us how it went.