What is restringing, and how much does it cost?
Restringing involves replacing all the strings and pins on the piano, and is definitely a job for a qualified technician. There are on average between 210-220 strings on the piano (depending on the model), all of which are held on to the frame under enormous tension. A piano will require several tunings once the strings have been fitted, and if it is an older model it may need further tunings. Restringing is not cheap, but on the plus side it should last a good long while!