I spoke at a Senior's Group in Salt Lake about my process of writing Farm Girl, and gave a few tips on writing from life. One of the ladies in attendance talked about something their group is doing called "Your Life in a Jar."
They meet once a week, and draw a topic from the jar, such as games played as a child, radio programs listened to, trips or vacations, meals, etc. Then they write on this, and they're ready for another subject the next week.
This is a great idea that eliminates one of the biggest problems in writing one's history-- feeling OVERWHELMED!! Most of us can write quite a bit about one topic, but when faced with the idea of writing an entire memoir, or personal history from birth to present? It's overwhelming to the most avid writer!
So there you go! Get a jar, start adding slips of paper to it, and when you have time to write, just pull a topic out of the jar to write about! Brilliant idea!