A few questions about rigging models

So, for a long time now, I’ve had the desire to learn how to simply rig one model to another models skeleton. Particularly for Left 4 Dead 1/2. Basically what I want to do is rig a model to one of the Left 4 Dead special infected’s, like what the guy did for the L4D survivors as infected. I don’t model at all, but I was wondering is, do I need common modeling knowledge for this or can rigging be done by anyone without any knowledge for modeling. Are there any very easy to understand and useful tutorials to understand? I’ve searched around a lot, but I’m not really coming up with good results.

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Am I making any sense or am I just dumb?

You will definitely need modeling experience, or at least knowledge of how bones work, and how your program of choice goes about attaching verts to bones. It would be quite a few hours of work to get from 0 to a final product, assuming you know almost nothing about modeling.