Garden statues are usually concrete or stone, heavier than they look, and detailed in ways that chip easily. Break multi-piece statues into sections and move each on a dolly to save your back and the artwork.
Pro tip: Move multi-piece statues in sections; a stacked fountain or pedestal statue is both heavier and far more likely to topple as one unit.
Watch out: Concrete statues are far heavier than they look; never lift one alone, and wear steel-toe boots in case it slips.