If I taugh a class, here is some points I would make, in more words than this but here are terse points:
-Firearm knowledge, is trivial
-Shooting firearms, is trivial
ANYBODY, with not much effort, can learn how to take a gun a part. They can memorize different pistol types. AND they can learn to be very accurate, without much effort. Firearms are designed to be easy to use, and easy to learn, and easy to shoot.
You are nobody special because you have a gun, and the trivial knowledge you have of it. If you are a CCWr, you are someone responsible however.
I'd like to point out that from cases I have been reading, when a person comes off as some type of "firearm expert" they tend to get eaten alive by the prosecution, becuase its easy to make it look like you used excessive force.
Be competent, and just rember nothing about firearms is rocket science, except maybe making them, which no one does except a few.