If you do buy a book set for the A+ make sure it will cover the new test that is starting January 1st 2001
A+ is easy for a majority of the people on this web site because this is a hardware web site, and well A+ is about hardware.
However somepeople do have trouble memorizing the 15 IRQ settings (16 if you include 0), however that may be trivia to some, to others it can be quite the 'burden', i know a few people who have taken the A+ and they had a hell of a time momorizing the IRQ and DMA charts.
To each their own, however you should have some basic background knowledge before you take it.
do a search for A+ a couple million hits will come up... its VERY common