At LFI Ayoob has us do a lot of shooting with the non-dominant hand because he finds that in after action reports the good guy is often, 25% or more hit in the dominant hand or shoulder because folks aim at the threat and the threat is your gun.
We take a tight grip, cant the hand 30 degrees so the dominant eye can easilly see the sight, then pull the trigger. We did many dry fires, then six live fires at a time. Do from 7 meters, then 10, farther only if you are hitting. Aim for center mass. You'll be shocked at how quickly you get good.