Not sure if a similar tutorial has been posted but here’s my mini-tutorial on how to do it the AWESOME way!
(This tutorial assumes that you already have a skin modified and you simply want to insert it into the game. And that you know how to do basic source replacing/VMT modifying.)
Back up pak01_dir.vpk. It’s important that you do so, in-case you want to revert a skin!!
Open pak01_dir.vpk in Notepad++ (Or your favourite Hex Editor.)
In it you’ll find various VMT (Valve Material Files) all clumped together.
Find the VMT’s that link the material file that you’ve modified.
For this tutorial I have modified ChurchBus01_A and ChurchBus01_B
Find the VMT lines, and simply remove them.
Now simply place your modified VTF/VMT files in place!
Note: You’ll have to place VMT files along side, since you’ve just deleted the game’s VMT, in order to get it working.
Hope this helps, if not then boy…do I suck at tutorials eh?
edit: You need to rename the vtf to a different name, since the vpk step is only removing the vmt from the vpk. The original vtf will overlap the modified vtf if they’re the same name, oh yeah and the whitelist thingy isn’t required.