If you don't have door sills and such to traverse, you might try moving it yourself. I've used 1/8" thick UHMW-PE plastic, though that's kind of pricey. You can make your own slip and slide, to easily move heavy stuff over reasonably smooth surfaces. Get some large plastic trash bags. Mix up a bit of dish soap with water (Dawn is good and it doesn't take much). Spray the water/soap solution inside the bag - ( it'd be slippery with just water, but the soap acts to help wet the surface). Lay a couple of bags down with a bit over overlap and get the first one under the safe. Proceed to push and put the bags in front. Lengths of plastic pipe (like PEX) can work as rollers instead of the slippery bag idea.