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It is a low-level middleware that, as I understand, does not introduce anything revolutionary in the field of 2D drawing, but does what it does, standard drawing stuff, pretty well. I was personally able to compile Skia from scratch and use it in a small C toy project based only on the example and provided docs. If you have any prior experience with other 2D APIs like Postscript, Cairo, GDI, Direct2D, Java Graphics, even OpenGL experience might help, it should be pretty easy to pick up Skia. I think the API is quite clean and simple. As you say yourself, it is used in lots of other software, which should hint you that it isn't very difficult to use it, so you should rather identify what
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Skia
Discontinued Skia is a complete 2D graphic library for drawing Text, Geometries, and Images (by blackberry)
Anyway, a quick search pointed me to this tutorial, don't know if you have seen it, but seems fine to me.
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Also there's NanoVG if you really want a vector api in C, but don't need anti-aliased clipping.