I had mine 21 years ago, and it was great.
Couple of things...
As a few people have said, go to a highly-qualified surgeon to whom this is a very dull thing to do. When I had the assessment appointment, the surgeon inspected my eyes and I said, "What do you reckon? Can you do anything for me?"
He said, somewhat wryly, "Put it this way - you're not a challenge."
Which is great. If someone's going to burn a bit of your eyeball, what you want is for that person to think you represent a very mundane day at the office.
It doesn't hurt much, and the pain is not only bearable but brief. For me the problem was suppressing the understandable instinct to escape. Although I knew that this was something I'd signed up for, paid for and walked into of my own free will, when the bloke leaned over me with the machine, there was a very fundamental and animalistic part of my brain screaming, "He's after your eyes! Punch the fucker and run!" My fists were clenched throughout.
My eyes felt irritated and light-sensitive that evening, but all that was completely gone by the morning.
When I first talked to the surgeon about it, he said, "This is a very wonderful procedure with outstanding results, but it's not a miracle - it won't stop you aging. So you're not going to be free of glasses forever. Your eyes will still deteriorate."
He also said, "I can give you whatever kind of sight you want, perfectly, but not for all distances. For instance, if you're an archer, you might want great long-distance sight, but in a few years time you'll need glasses for reading. Or, if you work on computers a lot, I can give you the best sight for that, but in a few years time you'll need glasses to drive. So what do you want?"
Lastly, some people report that they get more glare at night, which I do. I'm not crazy about driving after dark.