If I’m in the car and I teach them from scratch then I generally don’t have a problem. I’ve taught 3 ex’s how to drive manual. One in my Datsun and two in another car that I have… Audi Coupe GT (My ex-daily driver)
The clutch in the Audi is still good and for each of them it got to a point where I got to their houses and told them to drive.
The Datsun is another story. The clutch was pretty much done anyway. Bad bad slipping under heavy acceleration.
I don’t think I’d try it in my 300ZX though. Well, maybe now that I’m swapping the engine, which would mean a new clutch. We’ll see next meet.