FOBT which you can do painlessly at home for a few dollars is not meaningfully less preventative than an invasive colonoscopy and carries almost no risk. https://www.nejm.org/doi/full/10.1056/NEJMoa2208375
That said, for someone with increased risk, nothing compares to a colonoscopy - at it does a better job of catching things early, before you start getting blood in your poo.
But if you are at a standard risk, doing a fobt every couple-few years is hugely important. Ask your doctor now!
www.nejm.org/doi/full/10.1056/NEJMoa1311194
Currently on 5 yearly review until I hit 50, as my oldest brother had the same cancer at 56, which sadly took his life, so I am not of standard risk.
Reading summary of that paper:
"The numbers of persons who would need to be screened to detect one cancer were 154 with colonoscopy, 166 with DNA testing, and 208 with FIT." So I'll still stick with a colonoscopy until something better comes along.
Of course, the best prevention is one that people actually do.
All in all, nothing to worry about, just do it.
Colonoscopies are no big deal from my perspective, but they do have some risk; bowel perforation being the primary one. The prep stuff is the worst aspect for most patients; I used to love lemon lime Gatorade before I used it once as a way of drinking the liquid laxative...