I wouldn't say that I am an extremely talented 3D designer, but it is quite surprising how much you can learn from simply watching people doing it.
I watched a few tutorial videos on blendercookie in the last few days, and got some very good ideas how to make models.
Obviously, I still need to practice a lot, and also need to watch a few more tutorial videos, but altogether I am surprised how easy it is to learn the fundamentals.
But why am I doing this? As I mentioned earlier, I'd like to write a few games, including Ninjas & Dragons, Grim, and maybe others as well. These days, you can easily get a 3D graphical engine and make it work with just a tiny bit of programming knowledge. For free games, you can also get a lot of 3D models, but if you are as picky as me, then you will never be totally satisfied with them.
This one is my first "serious" work. In the next few days I'll slowly form a dragon from this - as you can see, so far only the torso and the forelegs are sculpted, without much detail. Naturally, this model will never make it into the game - I am pretty sure that I will learn so much about modelling in the next few days that it will be better to re-create it from the scratch that trying to fix this model.
It is strangely satisfying to see as the shapes slowly starting to form something. It was a good decision to start learning this.