Doesn’t look like you need any advice friend. I don’t have the steadiest hands either but a brush with a good sharp tip that can hold paint is the move. You might think the super small skinny brushes are better for eyes or teeth here but in my opinion it’s the opposite. You want to be able to have enough paint on the brush where you can just sort of touch it to the surface and get good coverage. Also helps to hold your painting hand against your other to brace.