Zip the nut off with and impact wrench, and use a 3-arm puller to remove the pulley. Heating it up a bit with a heat gun also helps, but usually isn't neccesary.
If you try using a 2 arm puller, you'll more than likely bend the back of the pulley. Take the advice and borrow or buy a 3 arm puller, they don't cost much and are common. Good luck