How do I wrap a skin on a model?

I've been doing the thing where you convert to mdl and edit the skin line, but no matter what I do, or how many times I restart WE, i get the same damn "could not load". I've used all the paths i can think of. I'm trying to get the warden skin on the assassin. If someone could post a map of this, i would be appreciate so I can know what I did wrong.