Back about 4 decades ago, . . . a friend started me out on hand gun shooting with a tip that has made all the difference in the world for me.
It does not work for everyone, . . . but again, it did for me.
Pick up the handgun in your non shooting hand, . . . open your shooting hand so that the thumb forms one leg of a "Y" and the fingers the other leg of the "Y". Ideally, your elbow should be on a table, you should be sitting down, and your shooting arm should point almost straight up.
Lay the butt of the handgun down into your shooting hand, and start closing the fingers with the pinky, then the ring finger, then the middle finger and last of all the thumb. Force the thumb out and around as you close it. Lay your trigger finger along side the weapon, pointing it to the "target".
Now, . . . squeeze the shooting hand muscles as hard as you can for about 5 seconds, then relax them enough to still hold the weapon, but not be "shaky" as you extend your arm outward toward the target.
As you look down your shooting arm, . . . the tip of your elbow should be pointing to the floor, . . . and looking straight across the middle of the inside of your elbow, . . . you should see a perfectly straight line down your fore arm bone, . . . across your wrist, . . . and down the barrel of the weapon.
Adjust the grip to get that picture perfect, . . . concentrate your focused vision on the front sight, . . . lay it on the target, corrected by the rear sight, take up the slack in the trigger, . . . happy shooting.
I've shot this system for over 40 years, . . . and though I'll never bring home any Camp Perry trophies, . . . it works for me.
May God bless,
Dwight