A greenhouse is a large paneled frame that must be disassembled to move. The glass or polycarbonate panels are fragile and awkward, and the frame has many similar parts, so careful panel handling, labeling, and re-anchoring are the whole job.
Pro tip: Label each panel with its opening, since panels are cut to fit specific frames and are not interchangeable.
Watch out: Glass greenhouse panels are sharp and fragile, so wear gloves, support them fully, and crate them on edge, never stacked flat under weight.