Hi @chaoslillith ,
This is a really great course, I have watched it but not yet modeled Piero.
It depends how familiar you are with the latest Blender version and the changes since v2.66.
You may have some difficulty, but the CGCookie community is always willing to help out if you get stuck.
The modelling and texturing chapters should be ok as long as you are not trying to follow every keystroke and click, this is where most changes have been made.
With the rigging and animation chapters, these are difficult in any version of Blender, but again its possible, with lots of patience and community support if you need it.
You could also download Blender v2.66 from Blender Previous Versions .
Also I would recommend watching the lessons through before following along, at least a chapter at a time.
Good luck and hope to see your Piero flying through the gallery soon.
Happy Blending!
