alt Hacker NewsAbsolutely - factory repair guides/apps are the only source of truth for official specs, although 3rd-party manuals are very good as well. That being said, I've often turned 3-hour estimated repairs into 15-minute jobs through clever shortcuts. For example, rotating an alternator to replace the run clutch through the gap in in the intake manifold as opposed to removing the complete intake manifold. I think that's where using experienced (and resourceful) developers pays off.
Also, for sale: BMW E60/61 Bentley 2-volume set. Barely used.
Yeah Bentley (and in some cases Haynes) make good aftermarket manuals too. And you can find good information on some forums. But you can also find a lot of bad information. Reliably sifting the good from bad only comes with experience--much like in software.