Grocery stores, banks, offices, parking lots, whatever, if youre unlucky enough to be there to get it, it just is what it is, and its not your call, you just get what you get, and thats what you get to deal with. Might be something youre always told is all you need plan for, and if your lucky, youre actually ready for that, or it might be something you never imagined, and have never thought to try.
At the very least, you need to stress out the limits of what you carry along with your skills with it in practice beforehand, to at least have a benchmark and baseline, so you can know what to expect there.
And the whole point of pushing the envelope with different things in practice is, and no matter how silly it might seem, its so youve done things in practice that, while not necessarily something specific, scenario wise, its probably similar enough in many ways, and youre familiar and comfortable with shooting in ways you might never have thought to do, and have the knowledge and confidence to do so, should you have to.
Or, you can just wing it. Your call.
Seriously though, we all should strive to do the best we can, and even then, no matter how hard you try, there always seems to be more to do, and the older you get, just keeping up can be rough.
One things for sure, there is no end to it.