it's not so bad. unless they've already come in and have roots. but if you're just getting them cut out, it's not like many make it out to be lol.
mine were taken out last year. it wasn't too bad, but not too good either. I have a phobia of needles and finding out that they put you under by injecting you in the veins had me wound up. and every time I'm stuck with a needle I seem to get worse. so to keep me calm he prescribed 1 10mg Valium to be taken an hour beforehand.
I figured it would take awhile for it to kick in, but it worked really fast. I was trying to change the radio station and hit the awfulest load of buttons

then I fell asleep the whole hour until I got there. my mom had to help walk me in cause I had no balance. and as I was going back there I was texting one of my cousins, I couldn't type for crap. somehow I got an r in the lol. but I was calm, I even told him that he wouldn't get the needle in the veins on my right arm. he didn't listen, stuck me a few times, then tried my left arm. I was unconscious instantly.
you can't feel much when you wake up. take about an hour before it starts hurting. your jaws are going to be swollen though. they'll tell you to keep the gauze in for couple hours, but I say 30 min to half an hour cause my cousin and I think that made it worse for us.