It's not likely that your trainer will do it. I have done them, but with a Brio 10 electric airplane with large control surfaces and 3D throws. It's actually easy to do, just dive alternating up and down, pegging the gimbals to the top and bottom each time. Let the tail swing around along the lateral axis.

I found this searching for "Falling Leaf" on YouTube: http://www.youtube.com/watch?v=g467q7NbqJ4