When I was shooting 4 position small bore, we had a Marine on the team that was TRYING to teach his girlfriend. After an emotional session I told her to "Just modify the position to suit yourself. You can't shoot well if you are not comfortable." He went all "Basic" on her and told her she HAD to be in this position blah blah blah.
The last I knew he had an EX-girlfriend, and he is still a mediocre marksman.