"When I am asked ... for advice on how to get started as a nonfiction writer, I tell them to start small and look around." ... "The overwhelming majority of a writer's time is spent wondering why this world is not as vivid as he or she once — agonizingly, deludedly — believed. To write is to fail, more or less, constantly."
Tom Bissell, in his book Magic Hours: Essays on Creators and Creation. http://vsb.li/hfgjdl