My personal take on it would be to see if instead of scheduling it, you could come in at the first sign of labor. Even though I DID labor for 20 hours before mine, one of the best things was that my (42-weeker) picked her birthday! I can't imagine how under-developed she would have been at 39 weeks. Our ICAN leader here has had 4 c-sections, but all but one picked the day. She said scheduling that one is her only regret. Plus, babies exposed to labor hormones do better than those that are not. If you can't swing it, you can't, but I know it's what I would do in your position.
Buy a belly bandit. The soft bamboo one. I would say if you KNOW you're having a c/s, then splurge on it. Moving around afterward (and for me, riding in the car) is kind of not fun, and the belly bandit really does help SO much.
Ask for stitches, not staples. Uck.
IF you think you can handle the surgery OK, ask them not to put extra drugs in your IV. I forget what it's called, but there's something that a lot of women are given without being asked that makes them kind of forget most of the day of the c/s. The women I have talked to have felt robbed of seeing their baby born. They give it to you to help you relax. I did fine without it and am glad I wasn't given it.
I don't know if everyone feels this way, but I personally didn't feel comfortable putting pants on for over a month. I wore knit dresses.
Bring a boppy to the hospital, or make sure you have looots of pillows well ahead of time in your room for nursing. It is hard to position that baby ina comfortable way, and the pillows make it much easier.
I am sorry, I kind of suck at this.

My c/s was pretty terrible (the doctor's fault - not necessarily the surgery itself) and I usually try to block it out. But I felt compelled to respond because there are some things I wish I'd known (especially the Belly Bandit) and I
really hope you have a good experience. There are lots of women I know who put lots of thought and planning into their c/s and felt they had very good experiences - especially if they had a sympathetic and naturally-minded OB.
Good luck, and I will come back if I think of anything else!