From elsewhere, in response to sumdood asking what certifications he “needed” to have in order to teach home defense and gun safety:

At the heart, a “home defense” instructor asks (and even expects) people to bet their lives and the lives of their loved ones on the quality of the instructor’s information and the instructor’s ability to impart that information to them in a meaningful way.

If that thought doesn’t scare you down to your toenails, it’s not the job for you no matter what classes you’ve attended or what certifications you have. If it sounds silly or overstated or like anything other than the bare truth … same thing.

If that sobering thought does give you some hesitation, you won’t ever again ask how little education you can get away with having. Instead, you’ll start asking how much you can absorb, and of what quality.