In addition to Stan's excellent support video on the topic, I've also done something and taught this as well to help.
Once you find the fixed cue ball, the move to the cue ball center is really a fairly natural and subtle movement. Beginners (myself included once) want to make it into a larger more sweeping movement, but when you really look at the manual version it's only a 1/2 tip pivot, pretty small movement actually.
So once you find the fixed cue ball, without moving your head or body try letting your eyes shift to a spot 1/2 - 1 tip away from center cue ball. Where exactly isn't that important, but I've found if I look at the edge of the cue ball it tends to create too much of a move to center cue ball. Once you "see" this spot, then just move to center cue ball. Sometimes this can help people feel like they are moving more deliberately to center cue ball, as opposed to when starting from the fixed cue ball position where it can feel like too subtle of a movement at first. By glancing to the side a little more, your eyes/body/cue can feel like they are moving more directly to the new correct shooting line and to center cue ball.
One other thing I picked up from playing with SEE - once you have the fixed cue ball, you can also think about stepping more toward the outside or inside edge of the object ball, depending on which pivot you are using. For most normal shots you would be stepping toward the outside edge in relation to the cut. That small stepping motion can also help to promote the natural body pivot that needs to occur on your way down to center cue ball. And if you try both, just to check it out, you'll see that the difference is subtle but yet you will arrive on two different shot lines while getting to center cue ball on both shots.
The key to either method, as well as the more natural and taught method of letting the eyes lead to center cue ball, is the amount and direction of body rotation that naturally occurs in relation to the starting point of the fixed cue ball line. It's preferable to just let the eyes lead and follow as needed to the correct position, but sometimes when learning some of these more mechanical "tricks" are helpful to point out the correct movement or provide some confidence in the execution.
Just something to try, it's worked for me and when showing others how they should feel or perceive the movements.
Scott