V.S.
I think my daughter was 11 when she had hers out (maybe a little younger - I forget), and it was much harder on her as an older kid with anxiety than I think it would be on a younger child. Since having them out several years ago, she is hardly ever sick - it's amazing. And believe it or not - potato chips. It helps with recovery, oddly enough. Don't wait for pain to set in to give the next dose of pain medicine. Have lots of movies on hand. Lots of fluids. And I bought my daughter special lounge clothes/pajamas - it made her feel special, and because they were fleece sweats, we could go out if she was feeling up to it, but she also could just sleep if she wanted.
Good luck.