The biggest issue for a self-training tuner switching from harpsichord to tuning an old upright piano is less the inharmonicity than the high string tension- you have to hold the tuning lever quite differently and compensate more for the potential of the tuning pin to bend under pressure as it is being turned. This makes it harder to get the strings to stay where you want them, until you have had enough practice. Frustrating at the start. And rusty strings can fail to spread their tension evenly over bridge etc., too. Longer-armed tuning hammers are nicer than short as they give more control and require less force. But short & good quality is better than a cheap long-armed hammer with a rubbish tip. As well as books there are some utube demos of how to hold a hammer when piano-tuning that can give a convenient first impression.
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