I think that Sonya did a blog post or maybe a video on this very subject. You might search around the SCM website to find it.
Using CM’s methods is about so much more than just reading books. Most people don’t know what is meant by the phrase “living books” to begin with so I’m thinking that if you come up with a short little answer that covers various aspects of what you’re doing you may have more confidence in talking about it.
It helps to first gauge the person’s interest level. I tend to get all excited and want to share everything so I have to reel myself in before their eyes glaze over. 🙂