I thought it was for years but after seeing what a bow shop did and reading this forum for quite a few years, I'd think I have it down to a science. One big thing that help me was the paper tuning to roughtune it (a little more the eye balling it at first). Then shoot at different distances to fine tune it but before you do, cover your adjustment markings with masking tape and mark your setting with a pen so you can return to roughtune if you should go crazy and need to walk away for another day. However, I've no longer need to walk away. I feel I can set one up with in about 15 mins now.

Good luck