I'll give you my experience:
I got Lasik like Spring 2007. The procedure itself only takes like 30 mins total. For me, it went something like this;
You go into the office and the doctor goes over the procedure with you. The Doctor then runs some standard eye tests on you through the machines. Then they go numb your eyes (I'm assuming you've already experienced this if you're thinking about getting Lasik. My regular optometrist numbed my eyes a few times leading up to the procedure) and "mark" your eyes with a felt tip pen. It's weird because you can see the pen touch your eye but you can't feel it. At any rate, after that is finished, they take you to the surgery room, which is where the fun happens.
They'll cover one eye with an eye patch and leave the other eye open. Obviously, they're operating on the open eye. They'll move the machine over your eye and start the procedure. My doctor said this to me, "Now, when we start the surgery you'll go blind for about 3-5 seconds, but then your eyesight will come back". He didn't lie. The machine makes a loud popping sound and then your sight goes black. Now, I know you think you know what pitch black is, but you have no clue until you go blind. That shyt freaked me out. The eye that was covered, I couldn't "see" anything out of before the surgery started, but once the eye he was operating on went "blind" I could see the difference between not being able to see because it's dark and fukking not being able to see cause I don't have eyesight.
At any rate, after a few seconds the sight came back and my vision was 100 times better. My vision was hazy, but my eyesight was great. He repeated the same thing with the other eye and that was it. He writes a prescription for you and you have somebody drive you home.
The doctor does give you those glasses and your eyes will be very sensitive to sun light. My advice is go get the prescription filled at once and wait at the pharmacy until it's filled. I messed up and left the prescription at the pharmacy and went home and went to sleep. When I woke up my eyes felt like they were on fire. They were watering and I couldn't open them for longer than a few seconds because of the sensitivity to the light..and this was in a "dark" room. The glasses helped, but once I made it back to the pharmacy and took my meds, I was cool. I went back to sleep and when I woke up I was good.
I would recommend getting the surgery between now and early winter because you can't rub your eyes at all for however many months and you don't wanna be dealing with that during spring if you have allergies.