Repair manuals, for any product, are printed for the specific use and reference of manufacturer trained and certified technicians. The format on how it was printed is for the convenience of those who are knowledgeable is using them. This holds true especially for the automotive repair manuals. The manuals would have terminologies that could not be easily found in dictionaries. A good example to this is the Positive Crankcase Ventilation or PCV for short. Many mechanics are not familiar with it unless they have been trained where or how it can be located. That part has been overlooked or neglected in many troubleshooting because the mechanic did not know the effect on an engine. Some car brands have a PCV valve and some small rubber tubes, especially for earlier car models that did not have electronics in its system.
In using an automotive repair manuals, you should be able to differentiate from the original manufacturers repair service manual and a manual published for 'do-it-yourselfers'. There is a big difference because a manufacturer's version would require use of special tools of which most are not available commercially. Manufacturers require these tools to ensure that disassembly and assembly is accurate down to specifications and preventing damage to the parts. An example for a tool required is a caliper. There are commercially available calipers that are not graduated and there are Vernier calipers and outside Micrometers graduated for accuracy. For a week-end mechanic, you will not have all those three measuring devices, right?
In order to save you the trouble of studying, understanding and learning to interpret a manufacturer's repair service manual, get a D-I-Yer's automotive repair manual. It will also save the time and cost of trying to acquire the needed tools. Usually you will only need regular automotive tools. Of course this advice is for those who are not trained and certified automotive technicians. Based on personal experience, I have now more tools than what I need because of trying to keep up with what manuals require. In most occasions, special tools are only good for a one-time use because it can not be used on anything else.
In having a repair service manual or haynes repair manuals, we often get excited when we are able to fix a car problem. There is a tendency for some to try and fix what is actually not broken. Avoid being an itchy mechanic when you have a manual. When there's nothing wrong with a part, don't try exploring it. It might cost you more than what you've bargained for it getting the manual.