Starting from the 'front'...
Did you remove the bolts holding the fan on?...or if you have a 'clutch fan', the clutch? They are also what holds the spacer to the front of the pulley...and the pulley on the front of the water pump. Once the attaching hardware is removed, as was mentioned before, you may have to 'tap' on each of them, but they will come off. Each has a 'centering point' if you will...a slight protrusion to ensure it all goes together centered and correctly.
It can all be made easier if the fan shroud (if your car has one) is unbolted and laid back toward the engine. This gives you more room at the front of the fan. You can set it aside once the fan is off, just remember to drape it back in there before re-installing the fan(!)... Unless you like the practice of removing fans (you won't get the shroud in with the fan installed). Be careful around the radiator fins. They are easily folded over...and sharp like a knife.