A lot of stress comes from asking all these "what if" scenarios, and it's only going to scare yourself out of your pants. The unknown is scary because it's a big leap of faith. There are many aspects after the surgery that you will not be able to control. For some, it goes smoothly. For others, a myriad of problems. Whatever your outcome is, it's important to face problems one by one because it can be overwhelming after surgery. Also, do not be afraid to ask questions whether it be here on the forums, the ostomy nurse, or your surgeon.
It's normal to be anxious before something life-changing. I hope some of the research you are doing now can assuage some of your fears. It will be a new beginning. Sure it's scary, but for me, after going through all the surgeries for my pouch, the grass is certainly greener on this side of the fence.
-Rina