I have a life long friend who has only owned guns for about ten years.
He first bought a 442 and then a Mossberg shotgun. Both acceptable for home defense.
When he got the shotgun, I took him to the range for some familiarization and practice. He'd never fire a shotgun before.
The shotgun "range" at my club is set up mostly for patterning, not much else. Let's say targets are 25 feet away.
I showed him the correct stance and fired a couple of rounds from one of my shotguns. He then took his, ignored what I had demonstrated, and missed the target and said that his shoulder hurt.
I told him that was because he did nothing I had told him and everything that he had seen in movies and on TV over the years.
The second time through, he did what I told him and magically, he hit the target.
Same thing when he shot his 442 and I shot my 642. I mentioned that the safest place to be when he was shooting was standing in front of the target.
He didn't see the humor.