Measure the item in three directions
Record width, depth, and height. Note removable legs, shelves, doors, and sections rather than assuming a piece will fit as assembled.
Measure every narrow point
Check door openings, hallway widths, stair turns, elevator doors, ceilings, and the path from the room to the loading area.
Share conflicts before moving day
If a piece may not fit, discuss disassembly, an alternate route, or excluding it from the move before the crew arrives.