Okay, obviously, being a girl, I've never had this surgery. But I did have surgery myself for the first time about a month ago (on similarily sensitive areas, I would think). You sound worried about the same things I was, especially how to get through the surgery and the healing without letting anyone know what was going on.
It was tough, and a lot of dumb excuses were made for things, but generally people don't ask a lot of questions...
If you had any specific quesitons about surgery in general, you can PM me... I might be able to help (or at least calm you a bit
)
good luck