Put it in reverse. Use a breaker bar to loosen the pulley bolt. Slide a pipe over the end of the breaker bar to get extra leverage. You'll need a pulley remover...you can get one from Advance or any other auto parts store. It'll probably run you around $100 for the deposit on the pulley puller. I can't stress enough to use a torque wrench to put the bolt back on. Set it to the lbs specs. You can find the specs online.

BenGone, my father inlaw is trying to take off the crankshaft pully on his 01 ford ranger 2.5l to change the timing belt. I was wondering if you could help with that?