1. You're being as vague as possible. You said "I want the skin on a model ... so I can put it on a unit" well duh that's what you do with a skin, that's not what we need to know.
2. Seeing the skins you've listed it's become clear to me that you're either a troll or someone inept at the English language.
4. This stuff is not complicated. We're trying to be helpful but you're getting frustrated and telling us off. It's really not hard, and there are numerous tutorials
EVERYWHERE. Now in some of those skins you listed they lack tutorials, however, there are tutorials on most models and there are some here at the forums and numerous other websites. Hone your googleful.
Example:
http://www.hiveworkshop.com/forums/models.php?id=e5r25v&p=tutorial_import
Notice how this model's skin is added into the game. It's exactly the same way with replacing an in-game model's skin.
I'm going to type in all caps now, imagine I'm saying this to you very slowly:
YOU CANNOT SIMPLY WRITE WHATEVER YOU WANT AS THE SKIN'S FILE PATH IN THE EDITOR. WHEN YOU ARE IMPORTING A SKIN INTO A MAP YOU MUST USE A CUSTOM FILEPATH THAT IS DESIGNATED BY THE AUTHOR OF THE SKIN. IN THE CASE OF SOME MODELS, IT IS SIMPLY "FILENAME.BLP" IN SOME CASES IT IS "TEXTURES/FILENAME.BLP" IN THE CASES SPECIFIED BY YOU, ALL FILE PATHS ARE GIVEN, USE THEM.
If this stuff is still too complicated for you, perhaps you should sit back, take a break, and find something else to do. Seriously, this should be easy for you. I'm trying to be as concise as possible, it's not complicated.
I'll be happy to provide step by step instructions for the skin you're trying to import, but which skin exactly, are you trying to import? You list the above as examples for "skins without tutorials" so it's important I know which skin we're talking about since there is no hard rule to importing a skin, and perhaps the skin we're talking about here simply doesn't work? If you want some overall guide for importing skins, we've just given it to you twice over. Beyond that it's a case-by-case guide.