Im no expert but it seems to work. I read that you should hold the pistol with your strong hand tight enough so as to just start to quiver, not shake, just a very strong grip. Exhale half breath goes out Squeeze the triger once sight picture is where you want it. Keep hands strong. I have included the site I read this on. Hope it helps. Im sure that others in this forum can be a better source of info. The Bersa 380 as stated earlier is a fantastic firearm.
Check this out. How to shoot a handgun accurately by Massad Ayoob Issue #85