When I was a firearms' instructor, many moons ago, one of the problems that I encountered most frequently was that shooters seemed to be trying to choke
As is the case with just about anything that you can be told, one person can interpret it one way, another person another way and yet another maybe another way. Thus it is with the action known as trigger squeeze. When a firearms instructor tells a student shooter to firmly, steadily, slowly, and continuously begin to squeeze the trigger until the shot goes off - well some shooters immediately understand that the instructor meant to squeeze the trigger with the booger picking finger (this nomenclature is important, do not forget it, you will see why later) and that the instructor did not mean to also start to squeeze the grips with the rest of the hand including the other fingers, after all the instructor already described how to grip the pistol and it had notjing to do with squeezing the trigger. Some new shooters though do not understand it that way and start to squeeze the whole trigger and grip areas as if they were hanging onto to something for dear life and if they let it go it would cost them dearly. They are wrong about that (this too is imporant to remember as you will soon see).
Truth be told, the whole operation of squeezing the trigger of a pistol is actually very much like the action involved in picking one's nose. When you pick your nose (yes you do, you didn't think anyone driving by on the highway at 65mph noticed but you forgot that you don't have tinted windows on your car and I saw you) you place your booger picking finger (same as the trigger finger) inside your nostril (like inside the trigger guard) then find the spot on which to place it on the booger that needs removal (like placing it on the trigger that needs squeezing) then begin to curl the finger down (like the backward squeezing motion of the finger on the trigger) as if you were summoning someone (or a booger) to come to you with your index finger (as if you were curling your finger with squeezing pressure on a trigger to fire a gun).
Now remember I said that some people not only squeeze the trigger but also start to squeeze the grips too as if holding onto something for dear life. Well, you wouldn't do that when picking your nose would you? And why not? Because if you did that you would likely wind up with a bloody nose because you gripped down on it with your booger picking finger implanted inside of it. I mean squeezing down on the nose too hard while the finger is on a booger would just ruin everything (just as squeezing down extra hard on the grips would rruin a shot). What you want to do instead is to firmly, steadily, slowly and continuously make a picking or backward curling motions with your booger picking finger on the booger (backward curling and squeezing motion with your trigger finger on the trigger) until your objective is complete.
In the case of nose picking the objective is to have your finger come out of your nose with a prize snot stuck to the end of it and with shooting the objective is to completely depress the trigger to the rear to fire a shot having a bullet come out of the gun. Get that and do not forget it, snot out of nose, shot out of gun. While those were the objectives the job is not yet finished. While the booger is out of the nose and on your finger the job is not yet done because, as you well know, you do not want to hold onto a booger for dear life. What you want to do is follow through and allow the booger picking finger to uncurl in a smooth but rapid motion thus sending the booger flying off of your finger so you can, if necessary, start the process all over again to dig out another snot. This is pretty much the same in shooting as after the shot, you follow through with the action of the trigger finger and allow it to move smoothly and rapidly forward allowing the trigger to reset in case another shot needs be fired.
Remember as you carry out either of these fine motor skills, you do not want to jerk the finger performing the operation because both actions, jerking a booger out of your nose or jerking the trigger on a pistol you are firing, could have unwanted consequences. In one case it could be a scratched or bloody nose, in the other it could be a missed shot resulting in a ragged and bloody hole in you because the bad guy had better trigger finger control than you. I could go on with further in depth analysis comparing jerking the trigger with jerking a booger but one lesson like this should be enough for anyone's day.
All the best,