I just did mine which was a major pain. I initially rented the kit at AutoZone. However, the kit does not come with a 36mm wrench. Then, I purchased the correct kit from Kragen, but the attachment that goes over the 4 bolts on the pulley was too small. I re-rented the AutoZone kit and used it in conjunction with my newly purchased wrench. Unfortunately, I was beginning to round the nut because it was practically welded to the water pump. I eventually had my mechanic friend help me remove it. I unbolted the fan/water pump, attached it to a vice, and then we used a chain-style strap wrench, along with a pliers wrench to finally remove the fan. He suggested placing the wrench over the nut, then hitting it very hard with a mini sledge to shock the nut into loosening, if I were to do it again.
Good Luck!