Yes, I have fired a gun in real life, many times, and I know enough to realise that my aim is a lot worse when under stress. You can train at the range all you want, but how are you supposed to get stress training so that you can hold your nerve whilst shooting? I doubt all store owners are highly-experienced combat veterans used to being under fire.
I think you are lying as all of your statements have clearly shown that you know NOTHING on the subject.
Maybe you can go find a thread about baking cupcakes as the adults don't need your stupid advice on this thread.
I have trouble believing you ...