I've got mine done, didn't have it numbed though. The actual ache is kind of like when you bite your tongue and it lasts for ages sort of pain, if that makes sense? Mine felt weird/hurt and uncomfortable for about 2 weeks, after that your speech won't sound retarded and you will be able to eat properly.
You'll need to wash your mouth out while the swellings going down like 4 times a day after every meal and before you go to bed, a girl I know had hers go all infected and it was proper rank. After that once or twice a day as usual, taking the bar out and washing that too otherwise it smells of death.
I forget I have mine now sometimes, at first it feels proper alien, but after a few weeks you'll be reet, pretty much like any other piercing.