There have been several discussions on moving safes. Using the right equipment is the key. Youtube has a number of videos showing how it's done and where to find the equipment. I recall watching one man move a safe, that I estimate was 60" x 24" x 42", up a circular stairway by himself. The dolly he used was no doubt a rental but even if it rents for $100 per day it's easier than rounding up 3 friends willing to risk their backs and then having to buy them lunch and beer.