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Touch each piece and each part of each piece; if anything feels tacky, then it isn't thoroughly dry. You can also use a large, flat piece of cardboard or a sheet. This is a preventative step that will help prevent scratches to the wood while you are reassembling the piano. Consult your photographs and your notes.

Summary:
Make absolutely sure all the parts are dry before you begin to reassemble the piano. Put a piece of carpet on the floor before you begin. Reassemble the pieces in reverse order.