Maybe it's a case of stage fright? Maybe you can just order an inexpensive movement to practice on? After you worked on a movement, removed and reinstalled those tiny screws, moving the adjustment lever is not such a big deal.
I used to be apprehensive about setting the second hand. After much practice the center pinion seems large, and installing a second hand is no big deal.
As others have said: Support your hand. I like to gently trace from the top of the adjustment lever to the side, then slowly increase pressure. Magnification helps, as well as looking at it from the side, so you get a feeling for the vertical positioning of your tool.
Mechanical watches are an anachronism, meaning they are functionally obsolete. The current version is the Apple Watch.
Therefore the term "innovation" is a bit of an oxymoron when it comes to mechanical watches. You can only innovate so much, before it is not the "real thing" anymore. Seiko is pushing the envelope with the Spring Drive, but it may already be a step too far.
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