One drill that is great for focusing on target and triger pull is as follows: get a box and mix live rounds with dummy loads and either close your eyes and load your magazine or have a friend load your magazine randomly. Now when you shoot your brain will expect a boom, when it gets a click, or vice a versa. Eventually with prectice you will learn to keep a steady hand and focus on target without flinching. When that happens , you will be a much better shooter. Good luck and have fun.