If I were you, I'd go to a med spa for a free consultation to see if you even need it. They can also show you the equipment and discuss their procedure.
As far as my procedure is concerned, they do a chemical peel or dermabrasion before the laser treatment.
When I go in for the laser work, they put "ultrasound" gel on my face. Then they use the handheld device and hold it down on your skin and start zapping you. Feels like a rubber band snapping at you. My spa has a "chiller" that they use to cool the area before they hit it. And they go over my entire face (except eye and lip area) three times. I can usually only take two passes before I'm done.
However, the benefit to me is that it cured me of my lifelong acne, and helped to eliminate dark patches on my face.