While I have had parents dump off kids at 4-H Trap with a semi and no training, it's the ones that drop a small for age 12 year old off with a 30" full 1100 or such that bother me. Especially when they say, "I learned on that gun, they will too!" (Not surprisingly, I'd often find out they were not very good shots ...)
As far teaching the action, that's usually pretty easy. I had a girl who'd never touched a shotgun before working a TriStar Raptor with ease, and hitting clays well with it. 4 weeks later she beat her younger brother, who was on the school Trap team, with that shotgun.
We use a tristar viper for our "loaner" shotgun. Lucky enough to walk out the back door and shoot clays all day long.
As this has gone this far, this is what I have done in the past.
Set the machine up so it will toss the clay straight away. Personally I think that is the most easy target to hit.
Our tristar is a 20 and all plastic, I think if you are walking into this blind, with no shotgun shooting behind you, that big nose on a 12 will put an idea in your head, right or wrong.
During the summer we usually have a few people out, one was my sons new wife, all 5'4" and 100lbs of her. She ran distance in highschool and college. She is fit, but itty bitty. After the "normal" safety stuff, she had shot before just never a shot gun. and the loading procedure, one shell at a time for starters she was on her way. I think she busted her 2nd clay, and it was off from there.
It is fun when you bust them, frustrating when you don't. You want success.
Personally if your student is having issues with an auto, perhaps firearm sports are not for them. It ain't that hard....but then thinking is a lost art these days.
I do need to get a second machine, introduce another target. The one I have can fling them fairly quickly, but a second would sure be fun.
I run them off of riding lawn mowers, pull a trailer with the clays and you are set....until covid it was a every other weekend thing.