Had two taken out while awake, and two taken out when under.
First two weren't bad - you feel the pressure. The grinding noises make you want to puke though, and when it actually snaps, you sort of go into shock for a few seconds and feel all shakey afterward. Second two went easier - they asked me to count down from 100, I got to 97. Then I woke up to be shoveled into the car, and when I got home, I apparently pretended I was a zombie and trudged around the house trying to scare people. Took a nap, got up, hung out with friends.
The only bad part for me was a few days after the second two, where I suddenly felt TERRIBLE. I'd been driving all day and suddenly was just wracked with pain and overwhelming discomfort, burning up and feeling fatigued but like everything was rushing past me. Got home, took a shower, laid down with a fan on, felt fine the next day.
Really it's not that bad overall. Get some meds, have fun with them, and get snowcones and ice cream. Feels good man.