Why not start off with how to use Blueprint CSS (http://code.google.com/p/blueprintcss/) and then show how to extend it? Blueprint gets the basics very right indeed, and allows your readers to become productive quickly. Then you can move on to how to create your own page elements, how to modify Blueprint, etc.
WRT your question, when I was building my own tiny websites I couldn't understand how CSS would help me be productive. The larger the sites, of course, the more obvious that became.
Comments
Why not start off with how to use Blueprint CSS (http://code.google.com/p/blueprintcss/) and then show how to extend it? Blueprint gets the basics very right indeed, and allows your readers to become productive quickly. Then you can move on to how to create your own page elements, how to modify Blueprint, etc.
WRT your question, when I was building my own tiny websites I couldn't understand how CSS would help me be productive. The larger the sites, of course, the more obvious that became.