Is it that hard to install a peep sight on your bow?

I recently had my bow retuned major overhaul Dynamic column loaded, laser tuned, new string the whole 9 yards. I have never used a peep before but I have videotaped my form and the one serious flaw I have is anchoring my head/sighting it. I have tried my head more turned my head more straight to the target. I think I need the peep to anchor how I look at my pins and want to try the peep. Or should I let my local shop put it on and not deal with the hassle of doing it myself. Other possible problems?

I shoot about 50 arrows once a week and groups are 3-4 inches at 20 yards but I really would rather see them much tighter before the season is here. If I make the change I really need to do it now to get into form and a comfort level rather than blow the opportunity come the season. I want to successfully harvest deer not miss or wound them and 3-4 inches is way too much margin for error for me.