We used an engine lift to take my cab off, which was relatively easy to do ... as the cab was completely stripped. Doors off, windshield and backlite removed, etc.
Screwed an engine lifting (carb stud type) plate onto a 2" x 6" x 8' which we put thru both door openings. Came at it with the engine lift thru the windshield opening.
Going back on the frame was done manually, 4 guys and some ramps. Laid the ramps against the frame rail so that the poor buggers that had to cross the frame had a place to set the cab while they jumped over the frame rails.
I gotta say, it was a whole lot easier using the engine lift.