>>63811Don't know if this applies since totally different skill set, but you can try to brace/rest your hand on a slight raised stable anchor point next to what you are working on.
It's what I learned to do when I took a lapidary class, and also what I do when shooting "long" with air guns.
Basically you are isolating more of your hands/arms from what is adding to the shake so you can focus on keeping your fingers steady.
It's also something that improves with practice.