Scopes are easy to learn. In my classes I spend a full 60 seconds explaining them, and I've yet to have a student not just get it right away.
But like Tom says, Zebras in your camera and Scopes are very different things.
I always use 80 percent in my Zebras. What is correct exposure for skin tone? Well, depends on what you want that skin tone to look like.
As for correlating what you see in the camera and what you see in the NLE, that just takes practice to figure out. There's no rule that lets you make them look identical. The only way to do this is to have a professional monitor connected to the camera that has scopes built in like Flanders Scientific or some such brand.
Zebras are about exposure, about Luma values, not chroma values. Skin tone relies more on chroma than luma to look correct. So I don't see the connection between zebras and skin tone.