The authors point out that memoir is not biography. The hardest thing about writing memoir, they agree, is not deciding what to put in, but what to leave out.
They point to Emerson, Thoreau, Twain, and each other as models of good memoir writers.
Annie Dillard says that she writes memoir to fashion a text. She advises that those who want to preserve memories will avoid writing memoir since the act of writing an event often takes more time than the event itself. She compares writing to taking care of a baby. "You don't take care of a baby out of will-power, you do it out of love," she says. It's the same, she says, with writing.