The reversal is a simple painless procedure, at least for me it was. However, the adaption of your new plumbing can be more frustrating. Just recognize that this is normal and it may take time. I measured my improvement (reduced frequency and spasms) in periods of 6 week increments not days. Do expect some urgency and discomfort but do know it gets a better as time goes on.
Bratcat's reversal was much different from her 1st surgery. It took under an hour. She was up and out of bed almost immediately. She loved walking the floor (no real pain). And she smiled almost immediately after surgery! Even the nurses saw a difference (she was on the same floor, same room, same bed).
She had about 2 weeks of butt burn. Mostly because she ate so little that we think alot had to do with the gastric juices in her system. Now it is only when she eats some foods (which she does but she knows what to expect).
Her recovery time at home was also much quicker. She was back at school 3 weeks after her surgery. She could have gone back after 2 weeks but it was Thanksgiving weekend and she figured why go to school for 2 days and have another 5 days off.
Good luck. Feel good.