I agree with Rachel.
I've not had jaw surgery done twice, and (heaven forbid!) I would have it again if I had to. That I'd be willing to have it done for a third time has to be a good indication that I didn't find it to be too bad.
Pain wasn't really that big of a deal. My jaws ached a good bit for the first 24 hours or so, but it was nothing that Ibuprofen couldn't alleviate.
The hardest part for me the first 12 hours was not feeling like I could breathe. Due to the inflammation, I felt like my throat was closing up a bit. Being so weak and how hard it is to eat were the other hard parts. But, all in all, it really is not that bad -- especially if you have some help.
The psychological battle is often the hardest part for many people. People worry about how it's affecting their nose. People see swelling at the 2-week mark and (not realizing it's swelling) wonder if that's what they are going to look like permanently. And, you do get tired of the liquid diet and would almost be willing to sell your first child if you could just eat a cheeseburger.
But again, I really don't think it was that bad. I would have it again if necessary.