You can make this job a lot less "crappy" if you do a couple of things:
1. Before taking anything apart, flush gallons of clean water
through the entire system.
2. Put a plastic waste can liner and/or disposable aluminum
pan under every connection to catch any spills.
3. Pulling hoses off fittings is a lot easier if you warm the hose a bit first (Use a heat gun if you really know what you're doing with it...I always used a blow dryer).
4. In many cases, pulling new hose through as you pull old hose out can make swapping 'em out a lot easier. Buy a male-male connector, cut the ends of both hoses as cleanly as possible...you want to butt them tightly to create the smoothest unbroken surface possible. Use pvc cement, 5200 or whatever you have to "glue" both hoses to the connector...duct tape won't hold if you have to pull hard, hose clamps can get caught.
Warm the ends of the new hose and lubricate 'em with a little dishwashing liquid--or better yet, K-Y jelly.
None of this will make this job the most fun you'll ever have, nor will it help you cut those d'd zip ties...but it will make it easier and a lot less "crappy" once you've managed to do that.