A car jack has more than one use. The piano needs to be loaded onto boards because it can't move across a carpet. The tricky part is when you come to lower the jack. There will be an avalanche of bricks, and when they land on your arm they hurt and cut. The arm bleeds. All following occasions, common sense prevailed and the bricks were steadied before lowering the jack. 
A re-located piano and an exhausted knackered piano player, too tired to play it (today).