From "The Piano Book" by Larry Fine 

Movers like to tell stories like this one:

 
A young woman asked her father to help her move a piano from 
one place to another in her house. Her father got a couple of his friends 
to come along and they brought a dolly. While they were lifting the piano - a full-size vertical -- it tipped back too far and got away from them. 
While it was falling, its upper corner dug down through the wall. 
The trench it made was deep enough to sever an electric conduit, which shorted and began to burn. The "movers" were unable to stop the fire, which also spread to the floor below, another person's apartment. 
After the fire department was done, there was little left of the two apartments .... and the piano. 


Obviously, this is an extreme example of the damage that can be inflicted when moving a piano in do-it-yourself fashion. Even if you don't burn down your house, there is a substantial risk of personal injury, not to mention damage to the piano. 
 

Pianos are very heavy. The average spinet or console weighs in at from three hundred to five hundred pounds, full-size uprights at about seven hundred, but sometimes as much a thousand.
Grands vary from about five hundred to a thousand pounds, though a concert grand may weigh as much as thirteen hundred pounds! If it were simply a matter of weight, though, all it would take would be enough strong people to do the job. Unfortunately, along with the weight come problems of balance and inertia, knowledge of which can make all the difference in doing a moving job safely and efficiently. Piano moving may conjure up images of men with monstrous arms and huge torsos, but actually two or three people of average build can do most piano moving jobs - even grands if they have some brains, experience, the right equipment, and a knowledge of just when and where to apply a little force. 
Don't take chances, hire a professional! 

We do not move piano's at The Piano Doctor, but give us a call and we will be happy to recommend a qualified Piano Mover.