first off, before adjusting your sights or throwing a red-dot onto your gun, make sure you have solid fundamentals.
If you have a shooting partner, have them hand you your M&P. They can either hand you it with a loaded chamber, or empty chamber. when you pull the trigger on an empty chamber, you will be able to see that you jerked the trigger or not.
Here's a target of a friend that i helped out one day. I first had him shoot his way on the target on the right, then the target on the left was from doing the drill that i mentioned above. I think the left target was only 5-6 rounds and the one flier he knew he jerked the trigger right when he pulled it.
before the drill above I also did this drill with him at the range. it makes sure that you have a good trigger press. I used to do this but used coins when i started shooting years ago.
(only shown with 1 hand because the other was holding the phone to take the video)
side view
VIDEO0030.mp4 - YouTube
shooters view
VIDEO0031.mp4 - YouTube
doing it with a DA revolver.
VIDEO0048.mp4 - YouTube