For anyone that hasn’t read it: get “In the Gravest Extreme” by Massad Ayoob. It remains the single best book on what it -really- means to use a gun in self defense. It’s not all sunshine and lollypops. Even in the most justified of circumstances it is a life-changing event.
I keep several copies on hand and give them out to friends like they were gospel tracts.
Preach it brother! I keep an extra around too, and recommend it online to others frequently.