Getting better involves taking tips and practicing. I'm taking a guy out to work with his driving in a field. We will throw between 100 and 150 shots probably.
You can't take those tips from clinics and not practices them outside of golf. It takes a very long time to unlearn something, like the way you throw.
I'm fine giving people advice while they play. I've been focusing a lot on foot position with people this year. But if you want to really improve your throw, you need field practice and a lot of reps.