Why it helps: Sometimes we avoid the most obvious—and complicated—events that have happened to us, events that inform our whole life story. Let’s say your three-sentence exercise was Loving mom who worked all the time, no dad. Never really got over lonely childhood. Maybe you could try, “I was just a kid but...” or “I tried my best but...” Was there something else that happened that prevented you from getting over your lonely childhood? Did it happen when you were a child—or later? Did it involve parents? You don’t have to know the answers to these questions. Let the pre-written prompts guide you. “Don’t think and write,” says Temes. “Just write.” 

Start by writing the story of your life for yourself first. After you edit and polish it, share it with a few trusted people. Then, after you edit and polish it again, share your life story with a wider swath of people. This will help ensure your memoirs are your best possible work, and that your writing is something you’ll be proud of at the end of your life.
Limit it to 15 minutes, no more – at least at first. Fifteen minutes, three times a week, always at the same time and always in the same place. Stay there for all 15 minutes even if you can’t think of anything to write.  This will set up a rhythm, in the same way we get hungry at mealtimes whether or not we’re really hungry. This isn’t just about finding time to write your life story.
What were the narrator’s desires in the memoir? What was motivating the narrator to share this particular story with the reader? Often, memoirs can be cathartic for the writer. Perhaps the writer was trying to process a year of grieving and loss, as Didion does in The Year of Magical Thinking, or perhaps the writer was trying to describe a childhood in a concentration camp, as Spiegelman does in his memoir Maus. Consider the motivations of the writer for putting down their story and presenting it to readers.
Develop a central theme, main idea or thesis that clearly explains the purpose behind your autobiography. For example, your theme might be about how you overcame obstacles to become a stronger person, or it might explain why a particular passion -- such as mountain climbing or rescuing animals -- is so important to you. Back your theme with details and background information about your life experiences. For example, you might explain that your dad is in the military, so you've had to learn how to adapt quickly to new schools and unfamiliar environments. Or, you might discuss what it was like growing up in a poor, single-parent home, but how your family was always willing to take in injured or stray pets.