All of those "general" repair books are a waste of paper.
Chilton and Haynes are only slightly better. However, what happens when you look and realize they didn't document your particular model and year? Suddenly the book has zero value. They're still too general.
The factory tech manual is the only way to go. They're super expensive for some vehicles (Subaru), not written as well as you'd like for others (Mercedes), but most are excellent and highly detailed. They are what the engineers at the factory use to tell the dealer about how to fix your vehicle.
The next best is alldatadiy.com. Of particular value here is the cost and labor estimates.