I have helped move them. They are haevy, but with four or five string guys you can move them. More guys would be great, but only so many can try to get a handhold at once.
Make sure you go over it good for spiders...
Other wise, drain it well, flip it on it's side, and go. As Muleman mentioned, dollies are nice.
I have one friend; they have no real access for a big item to thier back deck. They had a crane-truck come in. Lifted it over the house and set it on the deck. Same as the do for roof top air conditioners.
They are not too hard to move. Just make sure to lift with your knee's, protect your back...
Obviously, make sure power ect is disconnected, breaker is shut off...