One, start writing your memoir.
Two, hire an editor.
Yes, you need an editor.
What I have noticed over the years is that many interesting, fact-filled and engaging memoirs are being written and self-published by RPCVs. However, a good number of them would have benefited greatly if they had been first edited by a professional editor. All writers need the fine hand of an experienced book or magazine editor to bring out the best in a book. If you are writing your story for your family or for posterity, you should do yourself a favor and hire an editor.
Also, a good editor will help you develop your story and get you through the tough spots with your narrative and prose.
If you can’t locate a person or don’t know where to look, drop me an email and I’ll help you. I have put a few RPCV writers in touch with professional editors who have all been, they have told me, a tremendous help.