One can't get around the basic requirement of being able to pot balls consistently at some level with reliable proficiency as a prerequisite to developing other skills and techniques through progressive drills.
If a person is at the level where they are having difficulty with aiming and potting straight-in center ball stop-shots, then that is where they are; and that is what they need to practice and drill -
progressively increasing the distances between the pocket, the cue ball, and the object ball, as comfort and control is mastered - before worrying about anything further.
If one can't consistently pull their pistol out of the holster without getting hung-up, or without their finger stuck in the trigger guard, what good is all the rest?
Just my opinion, BUT 90%+ of the pool population need to work on how to physically shoot the ball in the hole with repetitious form. They do not need to do drills to get better. Until having a Master Instructor "scold" me into shooting with repeatable form was I even allowed to shoot a single drill. Watch snooker players...they get it.
Lower level league players ask me what drills they should shoot to get better. Inside my head...you don't know how to shoot a ball straight in, why are you concerned with drills?!
My brain venting.
I am reminded of how the great teacher, Bob Henning, broke-down Mastering A Shot into 4 Phases of Learning:
1. Learn To Recognize The Shot By Name, visually, when it appears on the table.
2. Learn To Pocket That Ball.
BINGO. And there it is: Put the ball in the hole; do not pass Go, do not collect $200.00; and, at this phase, give no concern to where the CB finishes (
outside of scratching by following the ball down the hole) - until (
in BH's personal estimation) a 65% consistency-rate is assured;
3. Learn To Stay On The CB Line: Without worrying about having the CB finish within a specific target-area/zone, fist, master consistently staying on the CB line -
even if running short or long in distance during development - by learning to consistently stay on the CB line
after pocketing the ball.
4. Learn To Stop On CB Target: Learn to control the CB to finish within the Cue Ball target-area
"reasonably well".
I cite Bob's 4-Phase outline from
The Pro Book, to illustrate that unless a student can -
with consistent and with reasonable certainty - 'Pocket That Ball', development-wise, there is no reason to focus on anything further -
outside of basics of: stance, grip, aiming, forming bridges, proper stroke, rules and etiquette, etc. - because if a student can't pot balls consistently, they are simply going to spend an awful lot of time in the chair.
So how would I answer the up-and-coming player who asks:
"What drills should I work on to learn to shoot better?"; my answer would be:
"Learn the name of the shot when it appears on the table, and keep doing "the work" until you have learnt how to pocket that ball with reasonable consistency; then, come back and we'll talk some more and take on learning the next 2 phases of how to properly finish the shot - then, once you have mastered all 4 phases, then, you will be shooting better". - GJ