Skills are classified into

SImple – cooking, baking, food preparation, sewing, ironing, painting, cash register, handling basic mathematical transactions, answering phones, postal sorting, learning a route, delivery, sanitation.

Intermediate- next level of simple skills where the job takes more knowledge and education added on to the manual labor skills, a category which also involves judgments.

Add on the months and years of schooling here.

Expert- Years of constant repetition of physical skills, honed muscles, habits now second nature or ingrained due to continuous hand-eye coordination, now in the teacher category.

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So, I guess I’m saying there is no one answer to your question. Sorry.