I do recommend the Mike Meyers books, they are humorous as well as informative. The one I have also came with practice exams. The biggest hurdle will be the terminology and this includes technology that is no longer used, but you will need it for the exams. Btw, A+ requires 2 exams at $125 each. The 2006 version had a general IT skills exam, the 2nd determines your cert, whether it be PC tech, depot support, and remote tech. It looks like the new one removes a specialization, but it is still 2 exams.
I had already been in IT over 15 years when I finally got mine and had to study the material that I had never been exposed to, mainly legacy hardware that has been phased out. You also need to learn the correct responses in situations that an experienced tech might not consider as correct. Other than that it isn't a hard exam.
I have a friend who had a little PC troubleshooting experience and he took the A+ exams. This did get him a job in a shop, so I wouldn't say it is totally worthless.