1st time my wife shot a gun was a couple years before we got married, my Marlin M60 at some cans. That afternoon, she decided to try my Mossberg 500, with a 2 3/4 #6 in it. (She weighed 105 at the time) I told her 5-6 times to pull it tight to her shoulder, including 1/2 a second before she pulled the trigger.A buddy in the early 90's was a Class 7 'smith and brought some college kid from U.T. out to let him shoot his FA Uzi. Les had his 1911 on his hip and gave the kid instructions on how to hold it, lean into it and what to expect.
His final bit of advise was"...I'm going to stand behind you. If you let it get away from you or drop it while it's in full auto, I'm going to shoot you...in the head."
I think the kid realized right then the importance of maitaining control of the gun.
You guessed it, she flinched, pulled it away, and got slammed!! She threw it at me!!