If you're getting into cte, I think a good way is to nail to tennis balls to a piece of wood about a foot or two apart, and start trying to acquire the visuals in your spare time.
I know when I first started out, it took a while to understand the difference between lining up the correct points, versus drawing imaginary lines in my head.
Lining up the points (ex Center to Edge, Edge to A) is not a mental exercise, but serves to put your head in the right position. I know you can visualize imaginary connecting lines from anywhere, but until you move your head around and physically learn to line up those points at the same time, it will be frustrating.
I started from always crouching down directly behind the cueball, and looking around it till the appropriate portion of the object ball peaked around the corner, and i was staring directly through the cueball at where the edge of the object ball would be.
It takes a bit of tweaking at first, cause if you get one without the other, as soon as you adjust the other one, you have made a slight change to the first. In this way there is only one position your head can be in to see both.
So yeah, grab some tennis balls, mark the half points and 1/3 and 1/2 ball markers, cause that will require a bit of learning too.
Crouching behind the cue ball is only a temporary thing, and I know I was worried cause for the longest time, I could only line up the perceptions while crouched, and it was killing my back. But eventually you can transition to getting the perceptions while standing.
Also make sure your stroke is in working order, cause if it's not, you'll miss so many shots that you'll attribute to poor aim. It's nice to make sure there aren't too many variables. I recently started using the Shock Doctor Model 824, and am ordering the Pro Shot Glove. I don't use it all the time, but it's an ease on my mind when I'm practicing my aim, to know that my stroke isn't adding in any unknowns.