There are some issues with PDF, yes, mostly to do with reflowing.
In my opinion, at least, converting to epub when practical is a good idea.
PRS+ is basically a user-written upgrade for the Reader's own software.
Even Sony is dropping lrf in favor of epub.
Hmmm ... tips and hints ... get calibre ... point her at MobileRead, Project Gutenberg, Feedbooks, Manybooks, and the Baen Free Library ... that's really about it. Oh, maybe add a small clip-on booklight that can clip to the back of the case.
I hope that helps!
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