Mark,
   I have been replacing cooling parts and hoses, a few at a time, with
minimal loss of coolant.
   I recommend you assemble a couple of inexpensive devices to pinch off
hoses to isolate coolant loss . I cut up an old broom stick into four
pieces, each about six inches long. Pre-drilled holes in the ends so I could
use long screws to draw them together and clamp off the hose. The round
stick is easy on the hose. I do not recommend the specialty tools sold by
$ears. I regret my purchase, they were really crappy.
   One of those Tee's used for engine flushing came in handy for draining
with minimal loss.
   Resist using the screw type hose clamps in place of the OEM spring
clamps. I wish I had. The screw type are prone to leakage.
   On top of every thing, a judicious use of the archives will reveal a
plethora of tricks and homemade gadgets for filling and bleeding  the WBX
cooling system. It's good experience.
Have fun and see you at EveryBus..
Ken Lewis
http://neksiwel.20m.com/