Learning the most effective techniques in pocket billiards won't necessarily be comfortable or natural - we were not put on this earth to play pool so it's not natural for the human body. One thing in particular that most players don't do right is clearing their hips as they get down on ever shot.....this is rarely seen except in champion players.
Therefore there's some training that has to be done and some movement in the pre shot routine that most won't just "figure out".....they have to be shown, and this was true in my case and many other champion players.
There's one motion in particular that, when learned, alleviates the concern for "aiming systems" because it puts you in the ideal position to see the "shot connection/line"....this technique takes about 3 weeks to master, and once it's accomplished the entire game(s) opens up and becomes much, much easier to play. 'The Game is the Teacher'