I had just under 1500 hours (most of it as captain of a single pilot, 7 tonne helicopter) when the RAF, in its wisdom, sent me kicking and screaming to be a helicopter instructor. I said I knew almost nothing about flying helicopters and didn't want to go but they threatened me with a ground tour. So I gave in. But I was right, I knew nothing. I soon wished I'd taken the ground tour....and so did my students.