My first full lube job: 74 switches, two mistakes
The board was a cheap 65% that already typed fine, which is exactly when you're supposed to leave it alone. I did not leave it alone.
Mistake one: one brush. The kit ships one tiny brush, which is the hobby equivalent of the single flathead screwdriver in a toolbox. Lube thickens as you go, and by switch 40 the brush was dragging a dry coat over the housing rails I'd already done. Two brushes, alternating, is the actual unit of work.
Mistake two: generosity. On the stems I went for the "safe" thick coat. The board came back sounding deep and slightly wet — like typing on a rainy windowsill. The fix is not more skill, it's less product: one whisper-thin pass, and the springs barely get anything at all.
After a week of re-torquing and one round of re-lubing the alpha row (the one I stare at, the one I typed on first while distracted), it finally does the thing the videos promised: a soft, even thock that stays out of my head while I work.
Total time: two evenings and one regretful Sunday. Was it worth it for a board that already typed "fine"? Ask me again after my next deadline. I have not stopped tapping it.