I was visiting with my Dad about this yesterday. His take on it is, that if you have to think about it, ya need more practice.
Of course he has always been an amazingly instictive shooter (I will admit to some bias, he is my Dad after all).
When I was a kid and learning to shoot a bow, he would always say, "See the target, shoot the target, hit the target. That simple."
Seems like one common thing for all of us is, we just know when it's gonna be a good arrow.
OkKeith