Watch and learn.
This method of moving is standard in many parts of Europe. A lot of the old city centers and buildings that have been there for hundreds of years have no elevators and narrow staircases.
One thing is consistent no matter where you live: moving sucks!
The guys at the top should be wearing harnesses in case they fall.
did it ten years ago. got a permit from the city to ban parking in front of the house and had a friend with a lift pull in and we brought everything in thru the front porch. the only problem was the king size mattress. we had to use ropes and pull that up the back way. almost lost it a few times but we made it in, barely.