Usually older pianos are found covered by dust on soundboard and plate. I opened the lid to exam how dusty this Chickering was only to find hidden cash and jewelries under lid on plate. The owner complete forgot they were there.  We laughed hard. The soundboard cleaning tool can be found online like here. The design is to have something going through the strings to clean soundboard surface. A vacuum is handy here to suck in dust on cleaning tool.

First align agraffes. Run a fish line or plastic thread from bridge pins to tuning pins, turn agraffes till tight and top surface 90 degrees to the line. Set up for stringing. We use spools of strings of different sizes from # 21 to #13. Place soundboard protection in case strings scratch the soundboard. Jack up pinblock with pinblock support like this.