Same experience, I started in 1972 with air cooled VWs and this book, and got involved with US cars too (Chevrolets, Fords, etc) and when I needed a manual I'd go to the public library and photocopy pages out of Motors Repair manual or Chiltons.
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Also have shop manuals for most cars I have owned dating back to 1980 (Honda, Mazda, Toyota)
and later ones (1998 Jeep, have the FSM and all the supplemental manuals as well)
My 2007 Jeep's manual is on my computer, all 7,800 pages of it.
One of my good friends in HS was great with cars, his dad was the shop manager at the local Ford dealer, and they built a '23 TBucket when we were in high school (1969-1973 time frame). He drove around in a 1956 Ford Crown Vic Wagon with a Flathead V8 and a 1965 Mustang with the little inline 6. Also drove a Harley 883 Sportster to high school. Looked like Fonzy from Happy Days.