This article is from the Piano Purchase and Maintenance FAQ, by Isako Hoshino firstname.lastname@example.org with numerous contributions by others.
The most important thing, whether it is a cross-country move
or a local city-to-city move, is to find a mover who is
experienced in piano moving. Unlike furniture, a piano needs
special attention during a move, because of its delicate
moving parts, wood frame, environment sensitivity, etc. You
can pretty much kiss the possibility of receiving the piano
"in tune" good-bye, but you don't have to take more trauma
than necessary. The following guideline was written to give
you an idea of how to go about dealing with the move as
trouble-free as possible.