«هُوَّ كُل مِنْ نَفَخْ طَبَخْ؟»

The saying separates going through the opening motions of a craft from actually mastering it. Anyone can blow air on a cooking fire to get it going, but that does not make them a cook. Attempting something, or looking busy at it, is not the same as having real competence.

The rhetorical question, which expects the answer no, warns against counting someone among the skilled just because they have tried their hand. It doubts claims of expertise that rest only on visible effort or preliminary steps, and it reminds the listener that true ability shows in the finished result.

Use this to deflate someone who treats a first attempt or surface activity as proof of skill. It works as a skeptical aside, expecting the answer no, when a person claims expertise after merely starting a task. The rhetorical question makes it pointed, so it can sound dismissive.