I would think that a standard first aid book would cover many of the things that can go wrong.
This is true, to a degree. Unfortunately, I have to say, a standard first aid book would only cover emergency type situations and if you are also looking to avoid emergency situations an "aftercare" book would come in handy. Especially since first aid doesn't cover prevention nor does it usually cover specific things. For instance, one girl here recently posted about her nipples peeling after being used. She wasn't sure if that was normal and some girls wouldn't know that it is and wouldn't know what to do about it. But, say, if someone put together an "aftercare" book or guide (I am sure something out there MUST exist and if it doesn't it should) things like that could be explained and taken care of without much worry. I am talking about things like that, too. Prevention as well as aid is a good thing, I think.