The statement does not deny that actually doing stuff is important - "work steadily". However, these are just empty words to someone who tries to become a genius by hitting the books first.
My advice (yes, I do see the irony here) in this age would be to postpone seeking advice or reading about a topic as long as possible. As a result, your common sense sharpens and you may even come up with fresh, creative ideas that others perhaps didn't have.