Shaving for a routine exam is usually not going to happen. Shaving for the delivery these days I think is also a seldom practice. Prepping for a procedure in a clinical setting is usually done by nurses or orderlies.
As for doctors a patient that shaves the bikini area its not going to phase them.
In a play exam, here is how I would shave:
1. have the lady take a nice sitz bath to soften the pubic hairs.
2. Trim the excess length with safety scissors.
3. apply a pubic shaving cream such as the one listed in the following url. Preferably the unscented variety to reduce the chance of irritation.
http://www.shopinprivate.com/coocshavexge.html
4. Shaving, and being liberal with disposible razors, No more than 3 passes per razor blade.
5. apply a hot towel to the area.
6. Apply soothing lotion.
7. Proceed with Play exam