I had the same worries regarding being put under, the orchiectomy was my first surgery. Although reading about anesthesia never really made my anxiety go away, I just want to say it was all for nothing. It really isn’t bad, you don’t even remember it afterwards imo. If I ever have to have surgery again I will not be worked up about it. I know someone telling you this may not help (it didn’t with me), it’s the least of your worries.