Editing a Custom Player Model

Hello, I am trying to make a custom player model for a machinima I’m making and I’m wondering how I would go about replacing one model’s head with another head. I’ve looked up and down the interwebz and I can’t seem to find anything on this. What I’m trying to do is put a human head on the body of a custom model made by shotgunguy. The model is the urban trenchcoat. Please I would like to get this done as soon as possible. Thanks.

not possible without 3ds max.

What is 3ds max?

http://usa.autodesk.com/adsk/servlet/pc/index?siteID=123112&id=13567410

Personally I think it’s kinda stupid to want to do that kind of stuff without any knowledge at all.

Well, I wouldn’t like to bother any body with something like this. If you know of someone whould would do it for me that would be nice. Thanks for the link btw.