For me, learning how to install CS skins through steam took me a bit. However once you get it, it is very easy. So here I will try to make a good tut on how to install weapon skins (along with sounds, etc) and player skins.
How to install
Weapon skins are very easy. For an example I will have you download a custom skin/player pack you can get the Urban Gign
here and the AK-47
here Player skin(s)
Now that we have the skins ready lets go on.
First what you will need to do is go to your counter-strike steam directory (C:\Program Files\Steam\SteamApps\email\counter-strike\cstrike) and go into the 'models' folder. Make two folders within the models folder called 'player' and 'shield' (we will get to the shield part later. Ok so within the player folder you should have these following folders inside; arctic, gign, gsg9, guerilla, leet, sas, terror, urban, and vip. Open the 'gign' folder and put the 'gign.mdl' in there.
So go ahead and test it out.
Weapon skin(s)
Now before we add anything, in your models folder create a folder called 'shield' all your files with '_shield' you download will go there. However we don't have to worry about that for this model as it is a rifle.
Now in your models folder put all of the .mdl files in there (w_ak47.mdl, v_ak47.mdl, and p_ak47.mdl). There all the models are there.
Now we still have some sound files. Very easy. Go back to your cstrike directory and in the 'sound' folder create a folder within it called 'weapons' this is where all the files that use sound will go. So go ahead and add ak47-1.wav, ak47-2.wav, ak47_boltpull.wav, ak47_clipin.wav, and ak47_clipout.wav. There all set.
So go ahead and test out your new AK-47.
If it all works out you should have a new AK-47 and a new gign skin. If it doesn't you can private message me, give me a message through AIM @ Nightrain61.