Bottom line, spend a few hundred dollars to hire a professional so that someone doesn't get seriously hurt. I've witnessed a close call where a safe almost crushed some guys off the back of a truck.
I've moved my large safe at least 4 times. The first two times it required the help of 4 or 5 very strong friends and a strong moving dolly rated for as much as the safe weighs.
The first time we had to go up only a few stairs and it was very difficult and took at least an hour to move it only 100 feet total.
The second time we had to move it across town in a moving van, and go down a few stairs and then up a few stairs in the new house. I learned from moving it the first time and we used the dolly and some metal dowels to roll the safe. We also drug it across hard wood on a large piece of carpet. I've also read that some people use A LOT of golf balls. That seems like a good idea.
However, I've had Army contracted movers to move it the third and fourth times and I've watched them. One set of movers had a home made dolly that I thought was a good idea. It was a 4 short 2x4s nailed/screwed together in a square about 2'x2'x2'x2'. On the bottom of the square were 4 strong wheels (like large heavy duty casters). The movers simply laid the safe down and rolled it on it's side/back.
My last move required the safe to go down a flight of stairs so I had a subcontracted safe mover with a hydraulic safe-moving dolly/lift and straps move it, and even that took 3 people.
If you think of the damage or pain a 1,000 lb safe could do if it fell on someones' foot, leg, arm, hand, or even the destruciton to your floor, the $300 to move it is minor, especially when you are gonna spend $100 in food/drinks for your buddies anyway.