Crank pulley replacement

Here's one for the experienced people on the forums. I have a 96 ES 2.5L V6. I need to know what is required to replace the crank pulley / harmonic ballancer. Mine cut a pin that holds it to a gear and needs to be replaced. What do I need other than the pulley and new belts and what Piston is the #1 pistion?

http://files.automotiveforums.com/gallery/watermark.php?file=/503/293273avenger_v6_engine.jpg

Any help would be appriciated.

here's a link to a larager image of the one above (without the big circle and Arrow)

http://www.parts.com/schematics/images/mechanical/CHP030.gif

Ok so here's an update. To repace your harmonic balancer/crank pulley, you may have to remove all of your timing covers, your timing belt and replace the timing gear that's attaced to the crank. The gear and pulley over time may have rusted together. Good luck.