Some with lots of experience or skill can do a good job tuning by eyeball. Those that can't should use a tuning method of some kind to help them. It's an ethical issue, tuned equipment is more accurate and will penetrate better. Good tuning takes time and effort. Our equipment may be "simple" but that's not to be confused with "easy".
3 basic methods, bare shaft "kick" or shaft angle tuning, paper tuning, and bare shaft planeing methods. The "kick" and paper tuning are the same thing and are poor methods IMO. Because they do not seperate your form and shooting quirks from equipment issues that can be fixed. Many wind up with "kicks" or "tears" they can't get rid of no matter how hard they try and even if successful in shooting shafts straight or bullet hole tears, they find later they are over spined with broadheads.
The planeing method can be done with either bare shafts or fletched wide broadheads. The problems it shows you are equipment related, not form, so it works very well. Here is a description of it:
http://www.bowmaker.net/tuning.htm Hope that helps....O.L.