Tricks..there are none.
Tips.
Trigger control and grip are probably the most important principals of hand gun shooting. One thing a lot of shooters do wrong is have a really tight grip with their strong hand. This will cause 2 problems. One is muscle fatigue and the other is for lack of a better word torque. When your strong hand gets tired it will start to shake. This is bad. As for torque..what I mean is when you squeeze hard with your strong hand it will twist the gun to the left if you shoot right hand. The other thing it will affect is your trigger control. Make a fist with your strong hand, squeeze really tight and try and move your trigger finger as if you were squeezing off a shot. See how stiff it is and how hard it is to control smoothly.
The proper way to grip your handgun is a good firm grip with your strong hand. Just enough so you won't drop it. Now with your weak hand place your fingers over the fingers of your strong hand keeping your weak hand fingers as straight as possible. Place the thumb of your weak hand on the "web" between your thumb and trigger finger. If your shooting a pistol make sure it is below the slide.
Now squeeze your weak hand firmly applying pressure straight back with your fingers and ahead with your thumb. You will have to experiment with your thumb position as applying pressure in certain places will cause your muzzle to move. Your strong hand fingers should be relaxed. This takes practice which is where dry firing comes into play.
Trigger control is pretty straight forward. A nice smooth squeeze from start to finish. Don't pause part of the way and when the round goes off..hold the trigger to the rear until the gun comes down out of recoil. (this isn't easy if you are shooting rapid) If you let the trigger go forward as soon as the round goes off it is possible to move the muzzle before the round has exited the barrel.
One thing a lot of shooters do is watch the hammer when they are squeezing the trigger. This will cause them to try and anticipate when the round is going to go off and or stop squeezing to try and get a better sight picture,point of aim. front sight...front sight...front sight
Another thing that will help if you aren't already doing it is shoot with both eyes open.
A. in a SHTF scenario you will have all your peripheral vision and
B. you don't lose your depth of field
C. You can really get a clear sight picture.
It takes some practice too. I had a real hard time catching on to it.
Dry fire and practice all these things. You won't believe how much you can improve without firing a round.