I dated a paraplegic in college, so I understand why you want to have this surgery. I think it will make your life so much easier.
I have an ileostomy due to Crohn's, and it took it 10 days to start working, so I was in the hospital longer than most - 3 weeks. I was throwing up a lot, so they placed an NG tube, but again, my small intestine was just being lazy. Once it started working, I've had very few problems in the last 3 years.
Good luck with your surgery, and please keep us posted on how you're doing.