Mel wasn't kidding when he said it's like patting your tummy and rubbing your head.
Before I introduced my daughter to the double haul, I asked her to rub her tummy and pat her head - which I already knew she could do.
Then had her mime the double haul in front of the mirror just like Mel was doing. It"s a good way to get the hang of it, and get your confidence up before you start.
I think the "backcast' should be renamed the "upcast". Throw that rod tip to the sky.