I have been shooting a clicker for over ten years now, it will improve your shooting, only if you use it the way it is suppose to be used and that is to get you to full draw every time.
I never under draw or over draw so my arrowflyte is consistent.
If your so out of control that you cant execute a shot if your under pressure ( some one watching or a deer ) man, wait until a monster buck comes to pay you a call, that's why they make safety belts for the tree standers LOL.
String Cutter, it's in your head bro, set up the clicker and move up to 10 feet and start to relaxes, just practices perfect form, don't even try and group your arrows, just perfect form.
You will be amazed at how you start to take off nocks, just practising perfect form, then take a step back and repeat, then take another, as you maintain your perfect form, if you get out of control move back up.
By taking it vary slow to move away from your target and practising perfect form you will stay in control of you shot.
Hope this will assist you in becoming a better shot
PS. I use my clicker for hunting, I played with it to make it barely audible, it just makes a little bump.