I use a 1/2" breaker bar.
From the passanger side of the car, hold the KB tool with your left hand, almost flat on the engine. Then use the breaker bar almost vertical in the air.
Pull up on the KB tool while giving a nice big pull on the breaker bar and it should bust loose.
Remember to torque the new pulley on.
If your close to Carol Stream, I can give you a hand.
Kevin