Hi Paul, if you really want to learn Amapi -- both as a polygon and nurbs modeler -- you've got to get this:
Amapi Pro 7.5 Tutorials
You can watch the first three chapters online for free. It's expensive, but well worth it. Once you understand the interface, Amapi is very easy to use. I no longer model anything in Carrara; I use it only for rendering by importing the parts I modeled in Amapi as OBJ files.