Service repair and fine mechanics
A watchmaker's work takes place mostly at a table under good lighting and magnification with small tools and even smaller parts. It is quiet, concentrated work where a single mistake can cost hours of rework.
When a watch comes in, you start by finding out what's wrong. Does it run too fast, too slow, not at all? You examine the watch before you take it apart, so you know what you're looking for.
Disassembling a watch mechanism requires system. The parts are small and easy to lose, so you work neatly, lay out the parts in order and keep track of what belongs to what. Cleanliness is not just nice — it's necessary because even a speck of dust can interfere with a watch mechanism.
A watch movement is cleaned so old oil and dirt disappear. Then it is lubricated again—but only in the right places and with the right amounts. Too little or too much lubrication wears the watch and damages the timekeeping.
Finally the watch is assembled and the movement adjusted so it runs precisely. This is where patience shows: a good result comes from care in each small step, not from hurrying.