I moved my 480G display 15 years ago. It went like "clock work" but was very well planned.
My escrow closed on a Friday which is when we began tearing into the walls at my new place in order to build the stand to support the tank. We also dug a trench around the backyard so my chiller lines could be run through the wall, under ground and around the house (50') to the garage.
On Sunday I rented a uhaul and set kitty pools up in it. I also set kitty pools up at my new house. Water was pumped from the tank to the uhaul where all the live rock and corals were moved to. I also pumped water into trash cans where the fish went into. Once I got the truck to the new house, water was pumped to the pools in the garage and everything was emptied from the truck into those pools. This included most of my water. I then finished tearing down the rest of the tank at the old house. The tank had a wetdry at the time and I was careful to make sure that the bio balls remained wet while they were out of service.
On Monday morning, the tank manufacturer arrived at the house to pick the tank up and bring it to their shop for a complete polishing. Meanwhile the construction continued at the new house. Water was also delivered by Catalina water company which I had pumped into more trash cans. I spent a good part of the day wire brush scrubbing the rocks.
Tuesday afternoon around 4PM the tank was delivered to the new house all clean and scratch free. By that time the stand was ready for the tank so it was put into place. At that point the marithon of re-plumbing the tank began. By 2AM Weds morning/Tuesday night the tank was up and running with everything in it. A total of 4 days between escrow closing to setup complete. Not only did it go without any hitches but I never had a cycle due to the fact that I kept most of my water, live rock and bio balls without letting anything go dry.
Here are a few pics of the install back in 1997.
Tank just after it was delivered
Done setting it up.
After the water cleared.