Re-reading my first post, I can see that I really didn't answer your question. For learning purposes, I would start with the instinctive method. It is easy to switch from the instinctive method to a reference method; probably not so easy to switch back again once you start using outside references to aim. However, to actually use the instinctive method requires that you concentrate all of your attention on the spot you want to hit. I wouldn't worry about that so much until you learn good form. Instead, concentrate your attention inwardly on performing each step of the shooting process correctly until you master that process. Time spent shooting at close range into a blank bale without any target marks will facilitate your learning process. Of course, that gets boring after a while and you want to hit something. So take an arrow with a judo point and shoot at pinecones or plastic bottles in your backyard or a field somewhere to releave the monotony, but spend most of your time at this point in front of a blank bale.