acting cgi actors!

Ugh actors ! Very hard to find, specially if you're just starting like me and I'm really trying my best to create something out of nothing :( so! How hard is it to use one person as an actor? Wigs? Makeup? Very expensive right? But its one-time payment, I saw a video tutorial were you can use Blender to 3d face track !!!!! So I'm wondering if I can use ONE actor and 3d head replacement from 3d models is it possible?
The great thing about making movies is with creativity anything is possible. And
with digital (as opposed to film) things are easier than ever. There will be challenges
and it's not going to be easy but it is very possible.

I love your idea. I'm looking forward to seeing your movie using this method.