I've been doing pretty well learning Rhino for the past 3 months. There are still so many things I don't know how to do, so it alternates between fun and frustrating. I was just reading a post from 2007 about trying to learn Matrix and how it wasn't very interesting to me. I think my situation now, living in Korea and not having a studio, is really the only way I can learn it. CAD is only interesting to me now that I no longer have a studio.
I also started learning another program called ZBrush. I've been using it for about 2 months now. It's digital sculpting, it's like working with clay on the computer. I'm using a Wacom tablet and even though that is a pen on a flat surface, using it with ZBrush still gives me enough of a feeling of working with an actual material that I think a lot of the skills I learned sculpting with real clay and wax have carried over. It's a lot of fun but still frustrating in its own ways.
This pic is something I've been working on in ZBrush, following a tutorial on DigitalTutors.com. It's about half finished.
The hardest part about learning this software (both Rhino and ZBrush) is being a total beginner at something again. With metal I have always tried to keep learning new skills, and how to work with different materials but every time I started something new I was already bringing all my previously learned skills to it. For example, at the time I took some machine shop classes, learning to use machine tools (lathe, vertical and horizontal mills, surface grinder) was very different from all the hand work I had previously done in metal. But I was able to pick it up quickly because I already had about 10 years as a craftsman. Working on the computer everything is new. I said earlier in this post that I felt that the experience I had sculpting with real materials helped me ZBrush, but there's so many other things to think about when using the software that make it complicated. And with Rhino, nothing I have learned previously helps me with it, except for design considerations.