It is a major pain in the arse. when you are planning, do not underestimate the time it takes to tear down a tank and re set one up. thats where people get caught with their pants down and start losing stuff from insufficient planning and time.
just yesterday, I tore down my 72g tank. It was just part of my system, and I already had a frag tank plumbed in and running. All I had to do was take the rock out, move some corals downstairs to the frag tank, catch a few fish, drain the main tank, and scoop the sand out. how long? ...............7hrs and 6 beers. Imagine if you had to pack all the livestock, keep most of the water, and then drive somewhere, pack it all back in the house, and start setting up your tank from scratch.
Plan, plan, plan. Then plan for it to take twice as long as you thought. I moved my tank from here, to Columbus, OH and back. When I came back, it literally took me 6 months to get water back in the tank. good thing I had plumbed up some "temporary" holding tanks. If you spend a little more cash up front, buy a used pump, and some rubbermaids, you can set up temporary housing in rubbermaids, use your exisiting lights, skimmers, heaters and such, and you can take as long as you want to set the display back up the right way.