If they don't want to listen and follow basic instructions give em a go on a .375H&H. I'm sure they will listen with full attention after that...
Seriously, having come through the military system where they started with rank and smelly newbies and had to start from zero - I fully understand that you get a lot of people that think that firearms attack at both ends. But it's a pain having to go through everything step by step, then uncover the misconceptions and deal with those, unpick all the phobias and then start from scratch again.
My wife when I met her was a slip of a thing, just got back from cycling around Europe and 175cm tall/60Kg. Her worst thing was shouldering the rifle, she was really reluctant to pull the butt into her shoulder securely as being a very small boned female there wasn't much to pull the butt into. After the first crack on the edge of her boob she got the point I was trying to make... That was sort of the way things went forward from there, she still doesn't listen and moans when things don't go the way she expects.
Bookmarks