This is an interesting thread... here's my humble take.
I started shooting archery 2 years ago with a Browning Wasp I inherited from my grandfather. I brought it to the local shop, bought some arrows, took a lesson on instinctive shooting and went from there.
I spent many frustrated hours trying to learn to shoot. I shot split fingered, 3 under. I shot gap. I shot barreling the arrow. I switched bows to longbow. I tried different weights and AMOs. BUT I also read a ton on instinctive shooting.
First, I read Kidwell's "Instinctive Archery Insights." In that book he emphasized the 'pick a spot' method, positive thinking, and mental projection. So I started BELIEVING I would hit where I wanted. I avoided saying "I hope I dont miss!" And I burned a mental hole where I wanted to hit.
I then checked out Ferguson's methods. From him I learned the idea of arrow-focus, where he believes the archer should make the arrow an extension of his will or him/herself... to "be the arrow." I think he means, pick a spot, be the arrow... not necessarily to use the arrow to aim. This was a natural progression of Kidwell's psychological methods.
Lastly I read "Precision Archery" by Ruis and Stevenson. In this book they emphasize back tension and using that tension as the anchor point, not a spot on the face. The importance of this came through to me about a week ago. I just purchased a used Robertson Stykbow (which I absolutely love I must add) and was matching up arrows to it at the shop. As I was shooting, trying to get my elevation corrected, my friend said "you moved your head." Apparently, I was moving my head back as part of my release in order to lengthen my draw. So, remembering Ruis' warning that the corner of the mouth can be inconsistent, I began working on the back tension method. This took several days and several arrows cut to the draw I wanted (28"). I would draw and anchor on my face wherever, focusing on where my scapulas were, and how tight they felt. Then I checked the arrow on the bow and affirmed it was 28". After persistent practice, I have adopted this method.... SO after all this, here is my method:
1. Pick a spot
2. Mentally project the arrow hitting it
3. KNOW the arrow WILL hit it
4. Imagine that the arrow IS an extension of your intensions to hit THAT spot
5. Draw, anchor (back tension)
6. Focus on the spot and move my release hand back until the arrow is off the string (like a gun, the release should come as a surprise because you are really focusing on the spot)
In reality, this seems like a lot, until it just becomes HOW you shoot... then it takes seconds.
Using this method, I am grouping tightly at 20 yds., better than every before. I have high confidence in my shooting as well. Do I miss, of course, but that is why I practice everyday, and my misses are almost always fatal big game shots, well within the 8-9" range. Being a perfectionist, its never good enough, so I practice more.
Lastly, I should note the importance of finding a bow that works for you. Having shot as many bows as possible, selling, buying, trying out... I found that recurves, with pistol grip, AMO 58 or less, weight 45-52 fit me. My Robertson is a Vision Falcon IV, 58 AMO, 48#, Takedown Recurve. The bow, in combination with a good arrow, and the technique have ALL contributed to my shooting success.
The lesson is: try it all, merge it, and find the path that works best for you