man, all I can say is to jump in both feet. You will never learn how to paper tune or broadhead tune or walkback tune until you just go and do it. A week ago I had no idea how to tune my bow. Now, I have the draw stop timing and cam synchonized and could do it in my sleep!
If the arrow hits tail high, generally the nock is too high. if it hits tail right, you need to adjust the centershot of the rest. Move it in very small increments, very small, in one direction or the other until you see improvement. If you really want to do it right, bite the bullet and strip the fletchings off an arrow or two as that will amplify the problem, making it easier to diagnose.
I'm very much a rookie here but the likes of Deezlin and Javi here are the best teachers out there, they have helped me to the point that I got my bow shooting straight and I know just enough to be dangerous! Or at least confident I know at least a little about what we are talking about. I wouldn't have replied but I guess the pros aren't around right now!
