Professional scent evaluation involves much more than deciding whether something smells nice.
Trained fragrance professionals learn to recognize aromas, compare subtle differences, remember scents and describe them consistently.
You can start developing those skills yourself.
Smell a fragrance before reading its notes and write down what you notice. Then compare your impressions with the listed notes. Try the same fragrance again later and see whether your interpretation changes.
Over time, this helps build scent memory.
Even if you never make it your career, learning to smell more intentionally can make perfume shopping much more interesting.