What is the best way for someone to start their autobiography?

You work it out as you go along, first you just write anything then you put it into chapters and then you finally put it in some sort of order. I can't remember which author it was who wrote what I'm quoting but he/she also went to say 'write something' it may be terrible but at least you've started. If you think you've completed the book all you've finished is the first draft and this won't be good enough to publish. They said quite a lot of other similar stuff too but that's all I remember.