I hope this reply won't come in too late.
I must be honest here. you gotta have a very high pain threshold. Of course you can scream if u want but the fact is, B wax is a painful affair.
I suggest that in order to condition urself, u try armpit and leg waxing first. I did armpit wax for a year or so before going onto B wax. The first time was *whoa*
The most painful part surprisingly is the middle area of ur pubic hair. Not the sides of the vaginal lips or near the anus.
If u think u can take the pain, then give it a shot
My own personal take is it's not something I wanna do very often...