Hi, everybody gets scared when preparing for a surgery, that is just so common. When you actually go through the procedure, you'll know it's way less scary than you actually thought of. Just relax, when you are sent to the surgery room, you'll undergo general anesthesia or spinal anesthesia. It's just like taking a shot, in general anesthesia, you'll fall asleep in several seconds. When you wake up, everything is done. You would most likely feel you've had a great sleep.
Just follow all the guidelines your Dr. requires you to do, that's super important, every step is to make sure nothing unexpected occurs, this means to protect from accidents as much as possible. For example, you'll be required fasting, you have to do it strictly.