In the spirit of preventing someone from making my mistake ...
A cautionary tale about the perils of practicing incorrectly. With a concealed carry course, a few thousand rounds shot at the range, and more than that dry firing from mostly a seated position working on trigger control, I attended my first combat pistol course. Saying it differently, with that much firing, no coaching, and dry firing that was not founded on disciplined complete techniques, I had unintentionally deeply ingrained a dangerous habit without realizing it. After a trigger press, I did not unconsciously take my finger off the trigger. In other words, by just isolating my dry fire practice of aiming and pressing the trigger, I had developed an unsafe habit.
During a later stage in the training, when working on movement and hitting different targets, I focused on my movement and went on automatic for operating the pistol. That automatic had me unconsciously leaving my finger on the trigger at the end of a drill. Part of the exercise was to push students to fatigue so that they then realized where they needed to focus on fundamentals. For me, that was an extra unintended shot in a safe direction. Instead of shooting the rest of the class, I ran the drills from that point on dry firing with extra emphasis on finger position off the trigger at the end of each drill and then re-holstering. After four hours of dry firing, I hope I've unlearned my dangerous habit. The lesson for me was that dry firing must be done from safe position, through firing and whatever you choose to add, scanning, and then safely re-holstering.?
FWIW, I've now begun practicing based on Steve Anderson's "Refinement and Repetition"