After experimentation, and lots of help from this site, I managed to get my head around at least the basics of ChaiScript.
I'm intending on using it for a game written in C++ using Cocos2d-x
As much to remind myself as anything, I wrote a blog entry about setting up ChaiScript in cocos2d-x.
I'd certainly be interested in anyone with more ChaiScript and C++ experience than me (that's pretty much everyone!) taking a look and making any comments or suggestions for improvements.