Gamanit – I don’t really ‘read’ that kind of stuff in handwriting. I usually learn about more physically/neurologically related stuff. And once you have some of that stuff, you can build a small picture about some specific, related info. There are certain patterns that show up over and over again and are almost always on the mark.
I have no doubt, though, that if someone spends years ‘reading’ handwriting, they would be able to do so up to a point. In the limited way that you can read faces. As with the story about Moshe Rabbeinu you can learn what a person was born with, but possibly not what they have shaped themselves into.