Often when one must move an upright UP the stairs a grand board comes
in handy.  Put the board behind the upright and then set the piano on
the board centered so it does not want to tip.  Strap it down and
suddenly you can move that sucker anywhere you want.  It glides right
up the stairs.  If there is a turn in them that is another thing.

D.L. Bullock    St. Louis
http://www.thepianoworld.com/