Your feelings are normal. Think of how much better you are going to feel, and when all said and done you will wonder why you hadn't done this sooner. You will be in my thoughts and prayers.
Nerves are normal, but think of it this way. Why would you want to chicken out of a surgery that will make you look better, and be healthier? I didn't think so....wishing you the best you have a great doctor and you will do just fine.