If you know how to move one it's not that hard. When I had new carpet put in my house me and a buddy moved mine with no problem, it weighs 1860 lbs. with nothing in it and we moved it fully loaded weighing in excess of 2100 lbs. I'm not going to say on an open forum how to do it though.
I agree that moving them around in a room is not that big of a deal. There are a million youtube videos of various methods. I'm talking about moving it in or out of the house. If you live in a one-story ranch it may not be a problem. Going up or down stairs is another story. If you have to go down a steep, muddy slope to get to your basement door (as I did), it can be pain. Even the safe moving companies in town looked at mine and scratched their heads. I ended up doing it but it was not easy.