Something like this could definitely be scary, but my best advice is try not to look at it as there's that small percent that something could go wrong, but rather that there's a much bigger chance everything will be fine, and come out to your wanting. It's like flying for example. There's that small percentage that the plane could crash, making one scared to ride, but that is in severe rare cases, that almost never even happen. Everything will be alright.
I remember their was a Hanna Montana episode I saw, you know, when she was normal, on her getting a voice surgery. Same situation. She was really scared, but they told her not to be, and it turned out just fine for her.