An expert knows all the answers - if you ask the right questions.
As actors, you become an expert at starting over.
I know a lot about the Titanic. My dad was a Titanic expert.
I decided to do advertising, as ad films were made in only 10 days, and started assisting Sanjeev Sharma and Mansoor Khan. Surprisingly, I was a whiz kid and soon learnt to edit films and became an expert at it.