Whelp, I'll add my $0.02 to the discussion. I had a good friend who died of colon cancer and the only boss (now a friend) I ever had who had enough faith in me to get me promoted was yanked from the stage 4 jaws of death by skilled care. I've had the procedure several times and drinking the prep and the attendant results are, indeed, the worst of it. In fact, y'all have reminded me I need to get to the doc for a referral for another go (pun intended).
To those waiting for the procedure, buck up, it's only one day and it could save your life.
To those who are of the age and are hesitant or afraid, pull on your big boy pants or big girl panties, suck it up and get the job done; it's not fair to your loved ones or yourself to put everyone through dying of colo-rectal cancer. It's a long, horrible, painful process and it won't make for good memories.
If I seem overly harsh, it's because I've seen what it's like and I've been through the procedure myself several times. It's not as bad as the alternative, believe me.
Russ