In FAQ 12, on setting the font and size of a journal, the instructions could be refined by including one single example as follows:
GLOBAL_HEAD<= <style type="text/css"><!-- * { font-family: "Verdana", "Arial", "Helvetica", sans-serif; } --></style> <=GLOBAL_HEAD
This works for both Default LiveJournal and Punquin, as well as any other style which doesn't use CSS and therefore might get this overridden. (None of the standard LJ styles use CSS)
Also a minor note that font names are case sensitive might be helpful. IE doesn't care, but IE is wrong about more than just this.
I don't have faq-editing access, so someone else will need to make the actual adjustment! ;)