lizzy,
i got my first bikini wax when i was 14, we were going on cruise and my mom suggested that my sister and i get them.
it wasn't as bad as i expected it to be, where confortable underwear, go somewhere that you feel comfortable with the staff [afterall she will be looking at your, you know]
and def dont let your hair grow out like cr@zy, one time, i was going to get one for my summer vacation and decided since i was going to pay $50 dollars for it that i was going to let it grow out so that the entire root could be pulled out... AHHHHH bad bad idea, it hurt sooo bad and took double the time, so def trim.
oooo and another thing, i live in philadelphia now and many of their spa's dont offer bikini waxes, only like smaller/family owned places....
good luck, let us know how it goes