Replying to I'm getting a gum graph soon...

has anybody else had one? For you who don't know, it's the solution to a referring gumline over a tooth. They take skin from the inside of the roof of my mouth, place it over where it is needed, then cut a massive flap of skin right next to it to fold over on to it. It's an hour long procedure and I'm awake for all of it.
Anybody else have this done before? How bad was it and how long did it take to recover afterwards?