Congratulations for discovering this venue to pursue your upgrade.  Many others have done it and the community provides all the information you need to excel.  Suggest that you become a VIP to have full access to all information that will help you. Read the newbie board.

Also suggest that you seek newbie friendly providers and develop some credibility by posting some reviews.  Then the community will know you are serious and not LE.

BTW TER has a search feature that will assist you in finding providers that will appeal to what you specifically seek.

Good luck.

TER VIP membership.
All this is simply tools to help you find your way.
My advice is:
Be clean, be a gentleman.
Respect the providers price w/o haggling
Be on time and realize she may not be.
Respect her time and dont overstay your arranged timeslot
(She might have or business or personal commitments afterwards)
Give her notice (usually 24 hours or more), while you can find same day, usually its because you are either known to them, or its a slow day.  Most providers need time to check you out first