Oh, I just went through that headache changing out the water-pump, the T-stat, all the hoses, gaskets, radiator and the dumb fan-clutch.
As for that little hose atop of the water pump, yes, it's a bear to fight with to get it on right.
As for things leaking, I think the majority of time was trying to clean off the old gaskets from the engine parts to prevent leaks from happening. This is key to a good cooling system rebuild. I have a thread here that shows how nasty those old gaskets were and the scrapping (but carefully) to remove the cruddy old stuff.
I feel your pain of having that leak back there. It takes time to tear things apart to get to it all. That's the reason why it took me, a fairly decent garage mechanic 10 hours to do the job for everything. Why go back to re-fix something a second time.
71 Duster 340, 74 T&C 440-Interceptor, 74 Duster /6 225, 76 Aspen /6 225, 79 Volare S/6 225, 81 Pacer I6 258, 88 Colt I4, 85 Caravan 2.6L, 94 Caravan 3.0L, 96 Caravan 3.3L, 00 Ram Van B1500 3.9L, 01 Ram Van B2500 5.2L, 05 Caravan SXT 3.8L, 03 Ram 2500 5.7L HEMI