SetMaterial and Notarget Help?

[quantumoftoast]

I'm trying to make a function, that, when called, makes the player invisible, hides his world model, and notargets him to all NPCs. I am planning to use this in MULTIPLAYER, NOT SINGLEPLAYER.

So far, I have:

[lua]
function cloak()
self.Owner:DrawWorldModel(false)
ply:ConCommand("notarget")
end
[/lua]

1) Will this work?
2) If not, how do I make it work? I want the notarget to apply only to the player who has this SWEP, and who has called this function.
3) How do I make functions only call for the person holding the SWEP? For example, if two people have this SWEP, I want to make it so they can be invisible and notarget'd individually. I think that "self" has something to do with it, but I can't find anything on it anywhere.

Thanks for your help!