I know how you're feeling, I also have to have teeth removed tomorrow, four to be exact. What's makes the day worse is I have to meet some people afterwards while my mouth is still numb and probably bleeding a bit ^^"
I admit I'm nervous as well, I'm trying not to think about it too much. From what I hear though having teeth removed is nothing really to worry about, the dentist will numb your mouth and you won't feel a thing. You might have a sore mouth afterwards but I'm sure you'll be fine the next day. Stick to soft foods and don't try putting anything too hot in your mouth in the meantime.
You'll be fine, I assure you <3