to everything Larry says..
to be more precise, plan on getting dirty....if you are going so far as to remove the head, replace the hose at the same time.....only makes sense.
I would postpone this project too....and since I'm looking at the same thing in the spring that is exactly what I'm doing.
Craig is your boat an Islander 28? or do I have that wrong. I've got a 1978 Islander 32.....
nat