That I think is why many of us don't do it. A book seems like such a big task. Daunting and also final. You have to commit to the content of it. Those pictures are there to last. So all the fears well up. I'm not good enough. I don't know how to do it. I don't think I can finish it. Who am I to be putting a book together? Well, why not ? Even if you are the only person who ever sees the finished book, you'll have achieved something. The end result is a completed, finished piece of work - as polished as you can make it. It might be a file generated with a free pdf printer from any word processor, or a presentation tool, even Microsoft works or Adobe InDesign. It could be a blurb.com or lulu.com print-on-demand work. Perhaps you use it as something to approach a publisher with. It might just stay on your hard drive, never to be seen by anyone other than you. But it would still be a finished book. With your name on the cover. How cool would that be ?
But a book is a big commitment and a lot of work. That to me is the beauty of the SoFoBoMo challenge. It isn't a huge commitment. It'll all be over in a month, one way or another. You'll either have a book, or you won't. It can't stretch out into a multi-year or multi-decade albatross around your neck. You finish it, or you don't. So the scale is a whole lot smaller. The opportunity to procrastinate and prevaricate over choices or deciding when it is done just isn't there. The required number of pictures isn't too high - 35 - but enough that you'll need to engage, think about it and make an effort. Along the way you'll learn about editing your images - making those final painful choices on what to include or not. You'll probably learn a bit about book layout, design and what goes in to making a book. You'll find out how good you are at working to a deadline - or not. You'll actually finish something. That in particular is powerful stuff. It forces you to make decisions and live with them. You might find you don't like those decisions afterwards and that way, you'll have learned more than if you never started. I'm sure once you finish the first one that the next book will be that much more like what you actually want to create. If you never finish, you'll never get to start the next one and the next one and the next one.
The challenge would also be a fantastic opportunity to pick a project and shoot images on a consistent theme or subject. Return to a theme multiple times. Explore it. Go a bit deeper than those great one off images you always take. Or start a new short-term project if you normally work on projects already.
So give it a go. Sign up and commit to participating in SoFoBoMo. Make a book.