I am going to call the guy that originally moved it for the guy I am buying it from and see what he will charge. It is a lock company that does that. Will go from there depending on the cost. You can move most anything with a come a long if you want to. The good thing is that I have no steps to deal with and a concrete floor on both ends.

Without looking at your safe specifically, I can speculate a bit.  The thing you might be missing is the pins may have to be driven out of the hinge they are captive in.  When you drive them out, they slip into the other looser hinge, and you only have to drive them up enough to get them out of the captive hinge to release the door.   

When I got my safe, it was cheap because they had lost the combination, and the pins and hinges were worn enough that the door drug on the bottom.

I took the door off, drove the pins out, and turned new pins on my lathe to fit.  When I re-installed, I added hardened washers to space the door back to the right level.  Has worked flawlessly since.

My safe, once the door is open enough to clear the frame, will lift off, as the hinges are external.  If they are internal, hidden hinges, the pins might have to be removed.

It's not too hard to get a safe on and off a pickup bed. I ha the same move as you from the garage into the house with no stairs. I rented a piano dolly for $15. We had the safe in the house in position in less than 20 minutes. 

Al Foust

A couple of guys can move a 600 pound safe pretty easy. I have move numerous heavier ones with just another person and I'm not a big guy. Remember sliding it does not require you lift the full 600 lbs.