Tooth Extraction!!!? What are they going to do!!?

Im natalie and im 13 years old. Im getting braces in late july. I am supposed to get a tooth extraction where i had a root canal two years ago. It's the bottom row, and the second last. (it used to be the last, but my wisdom tooth is now back there.) After they remove my root canal tooth, I think they are going to move my wisdom tooth in the place where my root canal tooth once was. I just want someone who has had one or a dentist or something. Is it painful!! Am i going to be awake while they do it??! What does it feel like? Are they really going to move another tooth? What are they going to do exactly??