I have had braces since early May, and I have to say, they aren't that bad. During the first few days, they'll probably be sore and hurt a little. You'll be unable to eat hard foods, so stick to soft foods. But soon after, you'll get used to having braces in your mouth and you can also finally eat pretty much anything (except for sugared gum)!
P.S. I'm not wearing rubber bands or expanders, so keep that in mind.