Editing Valve textures?

Well, today I wanted to edit some textures on some Half-Life 2 weapons, or something. But everything is a .vtf or .vmt. I know how to make a texture… But how do I make it to where it properly fits onto a model? Also, how do I edit it in the first place… I know this is a minge question so, please don’t hurt me.

Download VTFEdit. Search for it on google. Then open the vtf up and export as a tga. Use photoshop or gimp and edit the texture. After you finished editing, open vtfedit again ad select import. Then select the tga you just edited and save as a vtf and make a vmt file for it.

Thank you so much. Yeah I already got VTFedit. Thank you!