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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.
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.