To add some other insight, if you have never done this before it's worth having the local boat builder
working in the yard provide one man of skilled labour and your husband work with them for the day. There is numerous technique which turn an average job into a good one and first time around the block its nice to have a expert hand, small tips like applying a rasp file to the underside of the skin fitting to help sikaflex adhere are the kid of tips the experts bring.
Ahead of the scheduled haul,out you need to have purchased all required hardware
, skin fittings, valves and hose nipples, hose claps etc, you will find a variety of sizes around the boat so take a rule
and measure the existing diameter as best you can.
I would allow one day out of the water on your own to remove old hoses and remove old skin fittings, this is often done by grinding the face off skin fittings as they are to far gone to unscrew so be prepared with grinder and rubber mallet.
As a rule
of thumb, replacing the entire skin fitting every 10 years is worth doing, that should include all components, hose clamps and I usually replace hoses where practical as often they are much older, prone to perishing and lack flexibility so it's nice to clean house and the hose and clamps are a small cost to do the job well. In the case of the head
area, the hoses should be the sanitary type and these should be refreshed every 4-5 years to avoid the inherent small from marine
bacteria build up. Good luck.