Any defense plan that involves the use of a weapon that DOESN'T involve actually firing it and making the threat to your life and property disappear is a shit plan. Ready your weapon out of sight (yes, this means you already need to have it loaded), position yourself in a tactically advantageous position, and make peace with the fact that no matter what you do, you're going to jail, so you might as well go to jail with the score in your favor.