I wouldn't bother with books, they really can't teach you anything worthwhile for skinning. XML isn't a programming language or anything, it's purely for layout like HTML.
You just need to know the basics and you can learn those from looking at some of the files already there. SI re-wrote everything for the FM series giving objects understandable names and making it far more user friendly. I mean, if you saw "stick_to_sides_attachment" and "left" in a line of XML it's fairly self explanitory. Code is indented/spaced too so different sections are obvious.
Compare how an area looks and how the XML makes it look like that, change a few things here and there.
Don't get over-awed either. It might look big and scary but it's simple. Anyone can do xml with some basic common sense and patience.
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