The teeth being pulled shouldn't hurt very much cuz they put a lot of numbing stuff on it The expander and braces with hurt a little in the beginning as they could chafe your mouth I'd just relax and try not to think about it when you get them put on
Braces hurt for a few says every time they are tightened, so eat spaghetti. They glue them on and it takes a while, the glue tastes REALLY bad. It takes at least an hour. I don't know about expanders, but my friends say it hurts getting it taken out.
Braces hurt for a couple of weeks, FOLLOW THE RULES, I did and my teeth look good, the put them on with glue brackets first, go on YouTube and watch and it takes like 2hours at least mine did. I didnt have an expander though