@fatdog
I was where you are at. There is a learning curve to pistol RDS if you are experienced with irons but in both my personal experience and professional experience transitioning in service LE iron sight shooters to RDS it is not as big a hill as Hackathorn makes it out to be. Volume will get you there. Repeating the same thing and expecting a different result is the definition of insanity.
I think the training process (and people’s participation in sane) is really where experiences differ.
What you do and how you do it comes first, volume is second. I personally I found that I had to make changes and clean up my presentation to “find” the dot consistently. This improved my times, not only with the red dot but with irons as well. As far as actually using the dot once the gun is presented, I found occluded practice (with the front of the optic covered) and training with an optics only gun (no BUIS) very helpful.
Most of us like to think we are self taught but true auto didactics are rare. Seeking out a bit of professional instruction, whether a class, a private lesson, or even a video lesson, really helps “round the edges” and avoid wasting effort.
Notice, I said, training and practice not necessarily shooting. While the dot gives significantly more feedback about what the gun is doing, thereby assisting in fixing other issues, acquisition and use of the dot is primarily a visual process. So rather than thousands of rounds you may need a few thousand reps, the majority of which can and probably should be done via dry practice.