Full Tutorial V2
Following many complaints and a review of my folders(which got botched) I'll give a full rerun of what to do.
Navigate to Steam/steamapps/common/Team Fortress 2/tf/custom/
Inside the "custom" folder if you have no folders make one, call it whatever you like, preferably "TF" then place the models particles and sound folder inside.
So to recap: Models,Sound, AND particles folder should go
inside steamapps/common/Team Fortress 2/tf/custom/
'If you already created a mod folder, for installing another mod just drop it in there. If not, make one