Piano Tuner for Piano tuning.
The room should be emptied of all distractions. This will help you eliminate mistakes which can cause you to break a string or cause other bodily harm.
Then open up the piano cover and blow the dust away. Make sure that there are no loose items or parts.
Then hit middle C and find the the hammer for the middle C key and ensure that the hammer is hitting one string.
Piano tuning is an art and should be done by specialists
Find the pin for the string. Do this by following the string all the way from the hammer to the pin that it is wrapped around.
Piano Tuning – Tune a Piano String
Now hit the piano key to actuate the hammer. Tune one string at a time by placing the rubber tuning wedges against the other strings while vibrating.
Loosen the string you’re tuning slightly before trying to tune it. You should use a tuning wrench to do this
Set the tuner to C and tighten the peg slowly. Over-tightening can cause strings to break, and then the piano will sound much worse than when you started. You may even want to turn the peg, now let the string rest for 60 seconds, then turn it again.
Tune to just slightly sharp. Tuning the rest of the strings will put tension on everything and put a bit of slack on those strings first tuned.
Remove one of the tuning wedges, hit the key and listen. Then tune the second string until tit matches the tone of the first string you tuned.
Repeating these steps with the rest of the middle octave. You can tune the higher and lower octaves to the middle one.
Tuning a piano is a specialized job. Contact a Piano tuner for help.