I'm no great actor, I'm just a voiceover person, but the ability to know how you said something and be able to say another thing just like it is a tricky and I think largely invisible skill.
It's very different from just talking or reading or even performing.
I've been thinking a lot about visible vs invisible skill layers. i.e every craft has outer layers of skills that laypeople can recognise, and inner layers that you need expertise and experience to perceive at all. Could y'all think of examples of visible vs invisible skills in your own discipline?