I had em taken out in October last year. I showed up for the surgery in the morning, went over the procedure with the doc for about 10 minutes, they took me into a room and lied me down on the reclining chair. Once the nurse gave me the anesthetic, the next thing I knew I was waking up. I didn't feel a thing, and was only out for about 45 mins. Of course my face was numb/swollen after it was over, but they gave me this headband/ice pack thing to help wear it down (that, and some meds).
I was lucky to have been able to spend a three day weekend recovering from the surgery (it would have sucked to have to go to school while my face was swollen and aching), so if you can, try and schedule a date for the surgery on a three day weekend/vacation week.
Altogether it wasn't that bad. I just took it easy during the recovery; watched movies, ate soup and pudding. Plus, the pain killers they gave me where pretty effective, so those helped a lot whenever the pain began to uncomfortable.