I've moved quite a few machines, initially using primitive methods, but am now older, weaker and have an engine crane, chain blocks, pallet trucks, and tractor with front-end loader, and no longer take pride in doing everything possible solo. Given the right gear, it's easy, of course.
However, before the mechanical aids came along, one of the most useful things was a pair of discarded formical-covered wardrobe doors. Things slide easily on formica! Lifting one end of a machine at a time, with pry-bars or suitably-placed jacks allows rollers to be placed underneath (scaffold poles, for instance, although smaller diameter makes handling rather easier) and then it's usually possible to insinuate a sheet of ply underneath the rollers, if one has to cross gravel, grass or uneven surfaces. I've never had to negotiate stairs with anything heavier than a Myford Super 7 (easy two-man lift, with motor and tailstock removed). Hats off, and sympathy to those who have stairs to contend with.
I've made various flat-plate trolleys, of various iizes, using scrounged casters and thick ply. It's often surprisingly easy to wrestle one end of a machine at a time a few inches up onto such a trolley, and then you're away…
It's surprising how much easier it is to carry a heavy lump if it can be slung from a long pole, on the shoulders of a couple of sturdy blokes (or, with the benefit of a longer leverage arm, a sturdy wife…). Knees bend, and only try to raise it a couple of inches.
And grippy gloves double your lifting ability!