You must be joking about the expert bit.
First did it when I was hour building for Cpl.
Then had to do heaps of it while flying instructor mainly to stop the punter from barfing.
And the few jobs I did do doing it, it was 20 mins showing how the camera worked and then sent on my way with a load of lats and longs and instructions that I had to be not above 600ft agl over the top of the sites when I took them.
I wasn't joking when I was saying about hanging the aircraft on its ear at 600ft AGL with the door off taking photo's.