I've done this a couple times now & the best way is:
Drain as much water as possible while relocating coral first.
Remove rock as it is getting close to the water a piece at a time leaving any pieces that are in the sand until all coral & fish are out.
Then go in for the fish, fill the temp home first so it's ready to go & put a heater in it to keep it warm as well as the coral bin & rock.
Once everything is out remove as much of the remaining water as possible, then last of the rock.
Scoop out the sand into a bucket & using a lg fine mesh fish net rinse 2 - 3 cups of sand at a time under the tap until water is clean, dump into a different bucket obviously ( you know that already )
Once it's all rinsed & new tank is in place reverse the order & rebuild.
That being said if you need a few extra heater I have a bunch you can borrow.
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