I have had very occasional proper training in little snippits. The best set up was the FBI course at Quantico.
I tend to cant the pistol (I was told) and when i disputed this they rigged me with equipment that allowed the instructor to see the targets and sights through my eyes and then play it back, in slow motion, on TV. I stopped arguing and started to work on my cant problem.
Without some coaching, we practice our bad habits and get good at shooting poorly.
I am tempted to go to Front Sight in Vegas. Would do it here, if offered.