Tamara offers sage advice concerning the basics of self-defense.
This constant assertion that if people haven't taken a refresher Tactical Disruptive Combat Pistol III [course] every year, shoot IDPA once a month, and carry a Roland Special with a two spare mags, a handheld light, a blowout kit, and a BUG, then they just aren't serious about self-protection is actively counterproductive in the wider shooting world.
"Putting on your shoes and walking off the beach" is carrying a gun...any gun...daily, getting at least a basic half-day class in when and how it may legally be used, and getting to the range with it at least twice a year to maintain some basic level of comfort with its use. If somebody does that, they are SO FAR ahead of the curve, statistically speaking.
There's more at the link. Very highly recommended reading - and advice worth following.