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You can get small clamp/vise tools that will fasten to a table. These will let you rotate the held piece in a number of different ways and would help fix one part of the equation.
To stablize the other side, try resting your forearms on the edge of a table and holding your hands together to form a triangle. Use both hands to hold your glue/brush/tweezers etc. The triangle with forearm support should help counter some of the shaking.
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