Why do you even go tease the dealer?
Anyway, if you have the proper tool, you can do it in five to ten minutes. There is a water pump pulley locking tool which I don't have. I use a pair of 12" adjustable wide jaw pliers to grab hold of the pulley, standing on the driver side of the car. Then with a 32 mm open wrench I turned the fan nut clockwise to loosen it.