Discovery still happens in the writing. You start in nonfiction with a whole lot more going for you, because all the discovery isn't waiting to be made. You've made some of it in the research. As you get deeper into a piece and do more research, the notes are in the direction of the piece - you're actually writing it.
Joan DidionDespite our preparation, indeed, despite our age, [the death of a parent] dislodges things deep in us, sets off reactions that surprise us and may cut free memories and feelings that we thought had gone to ground long ago. We might, in that indeterminate period they call mourning, be in a submarine, silent on the ocean's bed, aware of the depth charges, now near and now far, buffeting us with recollections.
Joan DidionMy writing is a process of rewriting, of going back and changing and filling in. in the rewriting process you discover what's going on, and you go back and bring it up to that point.
Joan DidionWe were that generation called silent, but we were silent neither, as some thought, because we shared the period's official optimism nor, as others thought, because we feared its official repression. We were silent because the exhilaration of social action seemed to many of us just one more way of escaping the personal, of masking for a while that dread of the meaningless which was man's fate.
Joan Didion