Had one done a couple of months ago. I had to do 2 enemas an hour before the test. It is a flexible instrument that is guided by the Dr. and you get to watch the whole thing on a moniter. It is interesting and not at all painful. Well, perhaps just a bit of discomfort. They are very good about maintaining one's modesty. I was not sedated, and did not need it. It was only a 5 minute procedure. Don't back out, it's not at all bad.