Someone I know has been trying to restore a vintage piano. Recently they gave up. Here’s how they informed me:
"After a few months of tinkering and even getting a computer program to record every key and build a tuning profile, then individually tuning 70 some strings before giving up (there are around 230 strings in a piano), I finally figured out how to tune this piano.
I bought a digital keyboard and put it in the piano frame.