disconnect the ignition coil and put a 19mm impact socket (1/2" drive minimum) on a long breaker bar and jam the bar between the frame and steering box with the socket on the center pulley bolt. Then, hit the starter for a second or two until the bolt breaks free.
To remove the pulley, use a K-D Tools 2291 Steering Wheel/Crankshaft Pulley Puller which includes the M8-1.25 bolts to fit the pulley bolts.
To re-install the crankshaft pulley, put the vehicle in gear, high range 4th or 5th gear, set the e-brake and put some blocks in front of the wheels (as well as behind). Then you can crank the bolt to the specified torque. Its important to use a high gear, not a low one, as the higher gear makes the e-brake more effective.