Read every book, blog, website, whatever, about what you want to be an expert in.
I've always been a secret locked-room fanatic. I read my first one when I was about ten or 11, Agatha Christie's 'Murder on the Orient Express,' with David Niven and Peter Ustinov on the cover.
My very, very first moment on set on 'Lord of the Rings' in 2000 was me in a lycra suit, six and a half thousand feet up on a mountain in New Zealand, standing in front of 250 crew who were all wondering what I was doing - myself included.
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