It has been said that practice makes perfect. I agree, and note that some people practice perfect, meaning that they practice things in an environment that doesn't include the chance that something might go wrong. When it comes to defensive shooting and the practice thereof, it's helpful to learn to shoot not only while standing upright with a functioning weapon, but also while moving, walking, crouching; while kneeling and prone; on your back and on your face; with your right hand and your left. The reason is because you may wind up in a precarious possition if ou are ever unfortunate enough to be attacked, and having the skillset to defend yourself like this may save you.
Another aspect that I've rarely ever seen practiced outside of the military is failure drills. Because, if you haven't heard, firearms can fail you at the moment of truth, and being able to deal with it could potentially be helpful. What do you do if your trigger mechanism fails, or a badguy's round disables your weapon? Hopefully you draw another gun! If you do that than you're not only a big dork, but you're a prepared big dork, and I like you. If you don't, than I hope you've tried to incorporate some failure drills into your range session so you have some idea of what to do if you draw your weapon and the slide and barrel stay in your holster.