Stan has made a similar statement in the past, even if he didn't realize what he was saying, though I believe he did. He said,
"Real aiming is a mix of conscious and subconscious behavior."
This is the reality of everything we do that involves mind-body preformances, such as riding a bike or juggling or typing or playing a musical instrument, or....playing pool. Stan summed it up in one precise statement, which explains why 10 minutes, or even 10 hours, is not enough time to become proficient with aiming. Simply put, aiming involves experience. You have to actually know what you're looking at in order to know whether or not it's correct.
It's a matter of training the brain (through practice and repetition), wiring together the neuro network needed at the subconscious level so that conscious awareness has a good parter to dance with. And that's what it's like, a dance between the conscious and subconscious processes.
Think of the old saying, "You don't know what you don't know." If conscious input/thought has a dance partner that doesn't know any of the dance steps, there will be a lot of stumbling and stepping on toes. The resulting dance will be guesswork. But, with a little training, the conscious mind can teach/program its subconscious parter, and then the dance becomes quite natural and easy.