I've never gotten an enema during a colonoscopy. May just be a difference in doctors. Regarding the prep, ask for Go Lightly. Much better.

Here's the deal - Lots of folks grow polyps, some cancerous, some not. It takes 3-5 years for the cancerous ones to get that way. This is why regular checks are important. The prep cleans you out so the doc can see the polyps and look for irregularities with the scope.. You will be asleep and never know what is happening.

When you wake up, the nurses encourage you to fart, and you will be really hungry.

Really no big deal.