SFM | How to make custom textures and change textures?

VTF Edit: nemstools.github.io/pages/VTFLib-Download.html Apologies about the audio if it sounds bad. In the short time I've been an Source FilmMaker animator, I've realised some of the people I know who also use SFM don't know how to make custom textures or change them. And after getting asked today, I thought "You know what? I'll just make a video explaining it." Now granted a long time ago, I made a sort of tutorial on this before. But I deleted it. And since I'm better showing and talking about it instead of explaining it, I made this video!