Sean certainly knew what he was doing. He arrived at the time we have agreed upon, and he immediately went right to work. The piano had not been tuned is a very, very long time, and I was afraid it might take him some time to complete his tuning, but it did not. The piano sounds like a different instrument. I did not realize how bad it was until Sean made it sound good again. I would certainly use him again and will recommend him to anyone who asked me for the name of a tuner. He is a very multi-talented guy and I thought he did a marvelous job.