oral surgery, right? My dad's got his wisom teeth pulled a couple years ago. He said he didn't feel a thing but obviously you have to have anesthesia injection, which is the only pain you would feel. Otherwise, it's going to be ok. The dentist or doctor, or both, that my dad went to, is an MD also. I heard that there's only like 3 of them here in fresno that is like him. There's gotta be a ton of them in San Francisco.
Relax, don't worry. After that, you get to eat (or drink i should say) a nice milkshake. ;)