Much has been said about practice, but what kind of practice? If you continue to practice making mistakes, you will eventually get very good---at making mistakes!
Sight picture and trigger release is everything on a pistol. All of my pistol competitions, except for large pistol silouette shooting, was one handed, usually known as bullseye shooting. This may be the hardest of any type of shooting to master.
I would think anyone starting out should use the one handed method, because if you master that, you can shoot the pistol by any other method you desire.
The original writer said he shoots to the left. This means as you pull the trigger, your hand moves to point the barrel to the left. Trigger control is needed.
You should start with a good 22 revolver with good target sights. You don't even need anyone else to partially load the cylinder for you. Put in about three shells, spin the cylinder, aim and depress the trigger, always using it single action. After each time the hammer falls, whether it goes click, or bang, spin the cylinder, and do this until all the cartridges you put in the cylinder are gone.
Short of having a professional to teach you, this is the best way there is to learn to shoot the pistol.