Don't worry everything will be ok!
I had 4 wisdom teeth pulled a few years ago and I had never been knocked out before either. I went to an oral surgeon and he used the gas on me. All I remember was counting down from 10 and thinking he was the funniest guy ever. I woke up in the recovery room with some cotton in my mouth. I didn't have much pain at all, and I was good to go back to work in 1 day. I thought it was going to be a lot worse because of the horror stories my friends told me, but it wasn't bad at all!
Good luck!