He will use a medication to freeze your eye muscles in place and another medication to keep your eyelids open, so don't worry about that part. He has a head and neck brace to keep your head still and they'll tether your hands.
If you've ever had difficulty with any anesthetic of any kind he will be happy to have you tell him about it before he begins.
I had Versed for the right eye, but just a topical for the left. The surgery takes maybe 10 minutes ~ unless something goes wrong! Versed will make you less upset in that case. Subjective time is about 8 hours of course!
Versed has a nasty side effect found in a significant number of people ... it not only blocks short term memory, it can cause short term memory problems for a looooong time after the drug supposedly wears off. My brother had surgery years ago and the anesthesiologist used versed to mask the pain of being awakened mid surgery to check nerve stuff. The versed wiped out memories ayear old and made it very difficult for him to remember things like phone numbers, names, addresses, or such. And no he does not have ‘old timers’. It was the Versed.