Are you setting up a basement sump, or moving as-is?
My advice/experiences:
-Be prepared for this to be an alllllll day event. Changing tanks and moving tanks has probably been a 20-24 straight hour experience for me in the past.
-Get a couple of brute garbage cans from home depot. 1 to mix water at the new place, and one to put your fish and corals into when you get them to the new house. You can hose them out and return them if you dont need them after the move.
-Try not to disrupt your old sand while you are draining the tank and then only save a cup or two from the top of the sand bed to seed sand in your new system. Toss your old sand and replace with new (otherwise you will have serious algae issues).
-Powerheads and heaters are important, as you'll want to get your livestock out of sealed buckets and into stable/aerated water ASAP
-Rinsing your new sand will prevent a dust cloud
-I cut up old filter socks and rubber banded them to MJ1200's to quickly collect silt from the water column