Showering yes, just so you feel better about someone you don't know looking around down there.
Shaving? Not really necessary, as they have women of all ages coming in, and there are quite a few who don't shave. I wouldn't know, but I think the majority of women don't shave...
My pap smears don't hurt, but sometimes when the doctor scrapes a little too hard, you might bleed a bit. It's okay

The thing I hate most are putting my feet up on the stirrups... I'd rather keep my legs closed. But you can'g et a pap smear that way