You can use an old drive belt and a pair of Vise-Grips if you can't get the right tool. If your belt is over 40k or so old, now's a good time to put a new one on. The 8mm wrench fits the two screws that hold the shield on. Second step is to remove the air duct that runs from the air flow sensor to the throttle assembly. A screw clamp at each end is loosened with the screwdriver, and the duct is gently pulled free of the sensor and throttle.
Third step is to remove the drive belt.
My car still has the sticker in front of the radiator showing the routing of the belt. If yours is not there, make a quick sketch showing how the belt fits over the various pulleys. Pull the belt completely clear of the pulley on the water pump. The next step is a little tricky, in that you need to either borrow or rent a strap wrench, or make do with an old drive belt and some vise-grips. If you have the strap wrench, go ahead and fit the strap around the water pump pulley.