To think of writing an autobiography is overwhelming, but consider writing a memoir one story at a time and it’s doable.
We want to write our family stories, yet may wince at the thought of an autobiography, a daunting word to say the least. Matilda Butler clarifies the difference between memoir and autobiography here. http://www.creative-writing-now.com/what-is-a-memoir.html
“An autobiography is—and one of the ways I think about that is as if it was a whole pie –it’s everything. But when you think about a memoir, it’s really a slice of your life.” The interview with Matilda is well worth the read.