If your writing is atrocious, or if you just need some help getting your thoughts in order, consider hiring a ghostwriter or a professional personal historian. Celebrities do it all the time. There is also a software that allows you to type your answers into a template on your computer, thus solving the problem of less-than-perfect handwriting. Many people also choose to type directly into an online template.
Conduct basic research. Depending on your story, you may feel you need to do in-depth research on a certain subject, like air force pilots in WWII or life in a refugee camp in Poland. However, resist doing too much research before you start your first draft. You may get overwhelmed by the amount of information you come across during your research and start to forget your personal take on the facts. Remember that your memoir should focus on your memory of the event, rather than be purely factual or completely accurate.
Organize what you've written according to cause and effect and action and reaction. Ordering events according to cause and effect is a natural process. Your car broke down, so you called a tow truck. That's cause and effect. You received a promotion, so you bought a house. Action/reaction happens paragraph by paragraph. He said "No," so you said "Why?" That's action/reaction. She set a wet glass on the table, so you placed a coaster under it, and remembered how your mother used to crochet pretty little coasters and starch them. That's action/reaction.
It was only when Sophie’s husband accused her of giving birth to another man’s baby that she went for paternity tests and discovered that her husband was right (sort of). The baby, then aged 10, wasn’t his, but she wasn’t Sophie’s either. She belonged to another set of parents, who had been raising Sophie’s biological daughter in a town several miles away.
Was your aim to succeed as a businessperson? To be the best parent you could be? To amass wealth? To become a musician? To find love or security? Whatever your goal, think of it as the unifying thread that drives your life, shows the failures and complications you overcame, and demonstrates how you ultimately achieved some form of success as the person you are today.
Not necessarily a writer, but still want to record your story somehow? Don’t think that there’s no hope for you. Consider making audio or video recordings. Audio recordings can be especially helpful. You can take audio recordings to a writer/transcriptionist who can then type out your story in a logical order. Working closely with a writer as you verbally record your stories can be an alternative when you feel you are too close to the story.
Identify the main characters. Every good story has interesting characters, friends and foes who help move the plot along. Who are the characters in your life? It's a given that your parents will play a role, along with your spouse and other close family members. Think beyond your immediate family to others who have affected your life and should play a role in your autobiography.