I would buy a massive 80G rubbermade tub. Fill it with water, salt it up to spec and begin circulating that water to the tank, and tank water to that.
Give it 48 hrs.
Then i'd move every living thing in that tank to the rubbermade, and cut off the flow between the two. set up the rubbermade to survive (heater, skimmer, circulation) for another 48 hrs.
Then i would drain the main tank until you have like 1" of water above the sand bed and get a strong friend to help you move it.
Then i'd fill it up with water and get it up to spec (actually, adjust the water before you put it in). Fill it to 1/2 height w/ fresh sea-water.
Wait 24 hrs.
Then i'd start moving stuff from the rubbermade to the tank.
If you have time do the LR first, and wait another 24 hrs. Then the corals and fish.
I know that scenario sucks, but IMO it's the most fool proof way to go about it.