I'm (finally) scheduled for orthognathic surgery on October 7, 2011. I'm having my pre-op appointment about 10 days beforehand. I also received approval from my insurance company a few days ago --I promptly put the letter on my refrigerator door with a magnet.
I'm having my lower jaw moved forward about 10 mm and also a Lefort 1, widening my upper jaw and moving it forward about 1 cm. I have some really pronounced asymmetry (one lower jaw is about twice as big as other), but apparently nothing can be done about that because of where my nerve is placed --that's disappointing, but I'm looking forward to having aligned jaws and being able to chew food properly.
I'm supposed to be in the hospital for one night after the surgery, and then I'll be sent home after they see that I'm stable and can open my mouth (although my jaws will be banded together for about 2 months). The surgeon says I need to have someone with me 24/7 for the first 5-7 days after surgery, so my mom is going to take a week of vacation to come stay with me. I'm going to type out detailed instructions for every possible contingency while she's here in case she needs something and I'm tired and incoherent.
I'm planning to take 2 weeks off from work, which my surgeon says should be enough (and I really hope it is, because I can't take off any more than that without foregoing pay).
I've had my braces on for about 20 months and had some extra teeth removed before getting them (and thought about the whole braces-surgery thing for a long time before that), so I've read plenty of blogs and had plenty of time to think about the ordeal --but now that it's one month away I need to actually prepare!!
My surgeon said I'll be on just liquids or anything I can "slurp down, like eggs" for the first 6-8 weeks, after which I can move on to soft foods. I've gained about 15 unwanted pounds over the past year, so at least I don't need to worry about becoming emaciated on the liquid diet

I also started working out 5 days/week this past week (which I should have been doing anyway!) so that I'll be in as good a shape as possible going into surgery. My surgeon emphasized that it's important to be up and walking around after the surgery, so I'll make sure that I take at least a few short walks around the block each day while I'm recovering, and then get back into the gym as soon as possible.
And I'll stock up on whatever supplies other people have suggested (I still need to make a list).