it isn't bad at all. i was fuzzy for the first day but fine by the second day. by the second day i was eating semi-solid foods (ie mashed potatoes, jello, icecream). i only had minimum amounts of swelling, but that was also due to the fact that i was careful and religiously iced it during the first day. even by the second day you're back to normal functionally, getting up and around--the only thing not back to 100% is your ability to chew and swallow. the only thing that bothered me about the entire procedure was when the dissolvable stitches were coming out--it felt like i was swallowing string for two days.
as for the people who claim it's so painful, the swelling made them look like a chipmunk, blahblah--those are just the wussies who are closet hypochondriacs. either way, your dr will give you a prescription for pain meds.