When the subject of penning a book comes up in conversation, I’ve had a variety of people tell me they’ve had a great story idea bouncing around their heads for years. Sometimes it’s a fictional novel idea, and sometimes it’s that they think their memoirs would be interesting. It might sound mean, but I think most people vastly underestimate how interesting a memoir has to be to ever get close to being published. Or a fictional story, for that matter. Anybody who has published a book gets the inevitable “I have a great story idea!” from folks who mostly mean…