Throw a king-size blanket over the top of the piano. Wrap the blanket around the legs of the piano and place duct tape around the legs to prevent damage to the piano legs.
Unplug the cord from the back of the piano and place it in a large plastic bag. Tape the bag to one of the legs or the top of the piano to prevent losing the cord.
Gather four friends or professional movers to help you lift the piano and carry it to a vehicle waiting outside and then to the new location. Open all of the doors ahead of time and move very slowly through doorways and corridors to prevent damaging the piano.
When you arrive at the new location, unless the digital piano has wheels, do not push the piano into place. This can bend and break the legs. Instead, lift the piano and set it in the proper location with the help of the four friends or professional movers.