Some stylized humans (critique is always desired )

Hello I have a question about Rigging, is it possible to rig a highpoly model?
I have no problems to make a lowpoly mesh out of these objects but i wanted to know if it is possible ^^ and were can I learn it?
the only thing I have rigged last month was a little monkey which you can see in this clip and I´m still a novice in rigging .:o