Launch and recommissioning aren't necessarily same
If you know the hull is sound, all the seacocks are closed, she'll float. Now the recommissioning begins, and the question becomes, will anything on it work? As someone else has already mentioned, check ALL your hoses and connections--especially hose clamps on the seacocks before opening any of 'em. Check the wiring for signs of fraying, cracked insulation, etc (most boat fires are electrical in origin). Rebuild or replace the toilet, pressure test the holding tank with clean water (easy to do: fill it, then block the tank vent and pump the toilet till you feel some real resistance, and leave it that way overnight...just don't forget to unblock the vent before you pumpout or dump the water.--in fact, check ALL the vent lines for blockages...dirt daubers love to build nests in 'em. Replace the impeller in the macerator (if there is one)...after sitting for several years, it MIGHT work once, and that's all. (In fact, it's a good idea to replace all the impellers every spring...they're inexpensive and better to be safe than sorry). Recommission the fresh water system according to the directions in "Fresh Water Maintenance" article in the Head Mistress forum reference library (on the forum home page). Read the owners manuals for all your equipment before operating it...some things can sit without harm, others need lubrication to prevent damage from startup after sitting unused for extended periods--and if you're unsure about what to do, ask questions BEFORE doing anything...'cuz it's sooo much easier--and usually a lot cheaper--to do things right the first time than it is to do 'em over.That about covers most of the systems...I'll leave it to the sailors to advise you about the rigging.