I had the exact same operation, though It was my right ear.
I had it done when I was in year 5 so I would of been, 9/10? and It was fine. over the years I've had many operations but that one, I suffered very litle pain as they bandaged my ear up so no one would knock into it.
The only problem I suffered from is my eyes swelled up, but they later found out I was extremly allergic to the tape they use to put of your eyes so you dont wake up! so I dont think thats a problem you would worry about.
The aneasthetic is fine, you just go really dizzy and then your asleep, and before you know it your back and awake! my aneastetist tickled my feet when i was going to sleep!
Best of luck! Im sure you will look stunning and be able to have your hair how you want it! (;