Ted Konetski asked about renting a piano tilter.  I can imagine that
someone would be wary to rent one since, if you have not used one
before, it is easy to get in trouble.  Part of my learning curve
involved having a piano take off when only half way up.  It stuffed
itself under my work bench flat on it's back, and the cross bar on
the tilter skinned up my shins.

Since the piano is gutted you might want to consider tipping the piano
up on end, replacing the casters and setting the piano back down.  When
tipping the piano and setting it back down, put a heavy blanket or moving
pad under the corner that will stay in contact with the floor.  The pad
should extend far enough so that the casters are on the pad, so that
the piano will not start to roll as the casters contact the floor as
you are tipping it.

It is wise to have a second person to help stabilize the piano as you
are tipping it.  Remember that on an upright the center of gravity is
much closer to the back than the front so be prepared for that.

John Dewey