Writing an autobiography takes guts and a thick skin. You are likely to alienate all but the most understanding.
Realize that once you start changing names, you no longer have an autobiography, you've strayed into fiction - and that can be good news. Autobiographies are hard to sell, even if compelling, unless you are a celebrity. If the story is strong on its own, changing the names, locations, and circumstances slightly, and marketing it as a work of fiction may be a good choice. You'll have a better chance of selling it, and deniability with your family and friends: "No, that wasn't you, What made you think it was?"
Good luck -Craven