When you buy a new pair of heels, walk up and down the stairs 10 times. Stairs are the most difficult thing, so if you can do stairs, then you can do everything else.
It's so difficult to actually come up with ideas that you really fall in love with, you know? That's the most difficult thing about filmmaking - and that's my main challenge in life.
In my own personal career, I have felt almost the most difficult thing to deal with is someone who doesn't tell you what they are thinking.