there are those that swear on bidets but ive never needed one. Blot and wash was fine for me. If you got one great, if you can get one cheap then by all means do, but i personally dont see it as an essential.
For the first few weeks you diet will be the same as with ostomy, and you probably wont be very hungry anyway, so but burn should be well managed. As you start to get more adventurous the problems may start to creep in. I always thought calmospetine was overated, but having used it i heartily endorse it.
As for the unknown...we kid ourselves...we know far less than we think we do, and we dont live long enough to worry about the smallest fraction of it. Your course is mapped out, worrying about it wont do anything, chill and resign yourself to fate, safe in the knowledge that the odds of a good outcome are in your favour and your getting the best possible outcome for your scenario (a pouch).
The best post op tip i can give you is walk....its the best way to wake the bowel after surgery and get you out of hospital. Walking is very important for bowel action.
i personally chose to go straight onto probiotics to help give me a healthy gut flora.. it stands to reason that it will need a helping hand after such a serious op and prolonged 'bad' diet. I wanted to minimize the chance of pouchitis.
wishing you all the best