The challenge with becoming too technical is it can block your natural ability to auto correct. Although I promote walking off the distance between the ball and cup when determining the width of the stroke needed, I believe looking at the cup while taking a few practice strokes allows the brain to naturally calibrate the width of the stroke needed. Reading the green from the low side and from behind the cup is the best way to see the target line but looking at the cup while taking a few practice strokes allows the brain to auto correct for any misalignment.
A great drill to develop your natural ability to calibrate your brain is to practice rolling the ball with your hand instead of using a putter. Practice from different distances and on different breaks. Then alternate from rolling a ball and putting a ball until you are able to accurately roll and putt to the cup. When taking this routine to the course, imagine rolling a ball to the cup then putt. Over time you will develop better feel for putting with amazing results.