The safest route is to buy all of the factory manuals. The information contained in those manuals is about 99% correct. The kicker there is that you have to take the time to sit down and sift through pages and pages of manuals to get all of the relevant information.
If you rely soley on the advice of people on this board, the accuracy rate declines. Some guys spout pure nonsense and declare it as fact. How are YOU going to know which is which?