Artists, designers, and colour technicians don’t rely on luck. They test. A lot. A quick swatch in the same lighting you’ll use for the final work can prevent days of repainting or re-icing.
Experts also keep repeatability in mind. For paint, that can mean mixing with the same brush size, stirring the same number of times, and using a consistent dilution method. For screens, it means consistent settings and device calibration.
If you’re trying to match a specific yellow—say, a brand colour—don’t aim for “pretty yellow.” Aim for “target yellow.” Use a reference photo in the same environment, adjust slowly, and record what you added. It won’t make you a lab, but it will make your results repeatable.