Fourth - *Screenshot 4* Open the skin file and then drag the files to the correct _model folder.
example: Files in folder v_pist_deagle should go into your v_models folder.
example: Files in folder w_pist_deagle - should go into your w_models folder.
If the file you downloaded comes with a folder do not put it inside your Models folders. ONLY (.vtf + .vmt) type files should be in yourw_models and v_models
Fifth - Once the skin files are dragged into the correct models folder, you are ready to play!