I had to have an op with general anaesthesia a couple of months ago or so and I hadn't had it before (general anaesthesia). It went fine though I remember I tried to resist it as long as possible and was very indignant about it all when I awoke, I didn't like the lack of control and as a result my eating got worse for a while afterward (I have eating issues). But if you can handle that and if you accept that really practically ALL general anaesthetic surgeries go fine, then maybe that would help. My aunt is quite the opposite to you, she said she was asleep (without drugs) before she was anywhere near the operating theatre lol.

Hey and this is an elective surgery for you, so you could look it up online or get somebody else to look it up for you and then they can tell you if it looks safe, lolol.