Second thoughts are absolutely normal. I would talk to the pair of surgeons that do that operation and tell them to be totally honest with you with regards of what you are facing.
I talked to two different sets of surgeons and and they were impressed by my research and 3
of the 4 felt I was making the right decision. Ask a lot of questions and meet with as many professionals as you can; e.g. chemotherapy oncologists and radiation oncologists as well as surgeons. You didn't say what stage you were at and that can have a bearing on how they will advise you. I wish you all the very best and hope you can come to a decision that "you feel" is
right for you.
Chip(from Knoxville)