I hate and fear the bikini wax, yet I do it because it's so convenient. My only advice to you is if you are going to get one, do it several days in advance. The first time I got a wax, I was supposed to go to the beach the next day - my skin is very fair and sensitive, and I had bright red dots everywhere (the pores where the hairs had been mercilessly ripped out). It takes about 2-3 for my skin to look "normal".
Good luck.
Tracy