I have 4 safes in my home, one fireproof in the floor, one fire rated safe from 1910, and two AMSEC gun safes. The one in the floor is poured in place, the others range in weight from 350 lbs to 800 lbs.
In my workshop I have a 2000 lb Bridgeport milling machine and a 4500 lb Southbend Lathe.
I have moved all the above items with 3 or less people, a little wisdom and careful planning. BTW - I'm an Electrical Engineer by trade so I don't do this all day long.
A good "Rigger" (usually a team of 2) can move any safe just about anywhere you want it as long as the openings and passageways are physically large enough to handle the safe.
If you are spending > $1500 for a large, well built, firelined safe and you are not confident that you can move it without damage, then you should pay the $250 - $400 to have a pro move it.
Note: 1000 lbs is unforgiving if it gets loose, especially if you are moving it on an incline.
Ryan