Extract the v_models into

C:\Program Files\Steam\steamapps\***youraccountname***\counter-strike source\cstrike\materials\models\weapons\v_models

Extract the w_models into 

C:\Program Files\Steam\steamapps\lhumphries\counter-strike source\cstrike\materials\models\weapons\w_models

Put the sound files into

C:\Program Files\Steam\steamapps\lhumphries\counter-strike source\cstrike\sound\weapons\

***if some of the folders are not in you steam directory...make them! seriously this is the most valuable advice i can give.  if u ever cant install 
something because you cant find the folder...make it.  Css works off its default and anything you put in will override that.

i hope u like the nade skin

my username is lhumpstein at fbsbanana so drop me a pm if u have any issues or queries...:)