C.
Do you see the hex head shaped doo-hickey behind the thingy where the water comes out? Not hex like an evil spell but hexagonal shaped. If not use the vise grips and tighten the screw on the vise grips so that when you lock them in place around the pipe going into the house it holds firmly in place. Take a ford wrench, pipe wrench, crescent wrench, whatever, and put on the thingy where the water comes out. Put the wrench on the faucet opposite of the outflow and on top of the faucet. Turn counter clockwise while holding the vise grips and pipe in place not allowing it to turn. The easy way is to heat it with a torch first but that isn't important right now. Loosen all the way off, ensuring the pipe doesn't turn, put silicone thread tape or plumbers putty on the threads and screw the new water thingy on in its place. Name it whatever you like, then remember to turn your main water back on.
Hope this helps,
FDC