People always ask me how I make "such wonderful models!" Or more specifically how I "lower the polycount so I can unfold the model in Pepakura?"
I often get the feeling that they think there is a magic button I push, or that I use some kind of secret tool to rebuild the models.
That is not the case, of course (sorry to disappoint you... ;o)
But the tools aren't the "secret" anyway, I think. It's much more important to understand what you're actually trying to do: there's a *big* difference between making a 3D model to make a 3D model, and making a 3D model to make a papercraft model.
Once you realize that everything will be unfolded flat, printed, cut out, and glued together again in paper form, you can try to make the most of that process and work *with* the paper instead of against it.
Examples work best when kept simple, but I think you get the idea. ;o)
Making a good tutorial on my "papercraft making methods" would be very difficult (and more importantly: very time consuming). Some day I might try, though. ;o)
But maybe when you think about this some more, you won't even need a full tutorial anymore!