C.C.
If it's just a bikini wax, it won't be a big deal. (You've been through child birth already - bikini wax doesn't hurt nearly as much, and it's over a lot faster! LOL). Go to a salon that uses a high quality wax. Good wax doesn't stick to your skin quite as much, so it doesn't hurt as badly.
If you're getting a brazilian... then take a handful of anti-inflammatories and drink a cocktail first, because WOW that does hurt.
In either case, it's worse the first time. I'd start with just the bikini wax and then maybe go a little further the next time if you are so inclined. Good luck. =)