Had mine done a couple months ago, put it off as long as I dared (53 at the time).
Prep >>>>>>>>>>>>>>>>>>> worse than the procedure, which involves some fat doctor sticking a camera on a water hose up your Hershey highway. Think about that.
Prep was pretty much "drink, poop, repeat" for 4 hours. You have no idea how much crap you have inside of you. It's astounding. Went from brown to bilious yellow green to clear to yellow green to a light yellow that Martha Stewart calls "
Sunrise Over Gary Indiana" on her paint swatches. Last one was semi clear with a couple of things that looked like caraway seeds and a
small Lego that had gone missing when I was 4.
Baby wipes. For the love of all things sacred, baby wipes. Regular toilet paper will have you hating life for three days.
Had them put me under while the procedure was being done. Lie on your side, count down from 100, and you don't remember a thing after 98. Nurse wakes you up and you truly believe in your grogginess that someone stuffed an Offenhauser up inside of you because you are farting like
A J Foyt's Watson roadster at the Milwaukee Mile. Blaaat blat blat blat. You have a ton of air inside of you and it's going to come out the way it went in.

Then the doctor comes in and hopefully you hear the magic words "clean save for a small hemorrhoid, see you in 10 years."
Have a friend drive you home. Do not attempt to drive.