Can you define what you are scared of particularly?
But it's perfectly common for people to range between uncertainty and outright panic. This is a big deal and you will be handing yourself over into the care of total strangers that you will probably not even set eyes on and letting them do things you have no idea about and that is scary. Only crumb of comfort I can offer is that these strangers do this several times a day, every day of the week. Or to put it another way, for you this is a big, unknown and scary deal, for them it's just another day at the office. But you can trust them. I used to be one of those unseen and unknown people in the OR and I took care of every individual that came into my care just as much as if they had been my own mother or father. They will too because they are professionals and know their job. So the only thing you really have to fear is the unknown and that we can help you with. Read around here and be educated. It will help you greatly.