its ok , anyone can log on the website and see the picture of disassembling. It should cover more common error issue such as error 1 , 3194 over all ok good for a start but this should cover what's already not there on the ifixit website should be more focused on software related mysteries.
This is an excellent book. Extremely well-written, comprehensive and with high quality photos. I have bought books like this before and been extremely disappointed as they often turn out to be cheap 'pamphlets' which are poorly written and have pictures you can hardly see. If you want a quality manual, then this is a good buy:)