People have different levels of fine motor control. I am blessed with very steady hands and short sightedness which is a boon in this kind of work.
How I generally work on very fine stuff is, I rest the sides of my hands with little fingers on each side of the thing I'm working on; this means the hands are steady and you only have to worry about the fingers being steady. I use some 5x or 7x stereo magnifiers and a bright light to give me a good view of the thing I'm soldering.
For even finer work, below the 0.5mm pitch I've gone to, I've seen people rely largely on masses of flux to correct errors, and using solder paste. By the way, although you can get auto solder paste dispensers which allegedly dispense a controlled blob of gop when you press a foot switch, as far as I can make out they aren't calibrateable for the tiny dollops needed for fine work. But my colleague made himself a dispnser consisting of a hypodermic syringe filled with solder paste with a screw tightening widget on the back to squeeze ou microscopic amounts at a time, which works pretty well.
Also keep in mind the trick of using a wooden toothpick to hold down the top of a component while poking away with a soldering iron.