Earlier quoted context omitted.
Probably it’s worth mentioning that the repair shops as we know them today didn’t exist in the world of Soviet cars. So everybody was responsible for his car and the owners were forced to spent weekends under the car in garage blocks sharing tools, knowledge and beer.
The manuals for the Lada were epic. In a quick search for an original one I came upon this [1] which is an English version one, which is even better than what I was looking for! It describes the entire car's operation and mechanism in extensive detail along with descriptions of how to replace parts, what might go wrong, and more. I'm not sure that 'just send it to the repair shop' was an overall improvement in societ…
Ability to self-service your car but repair shop if you don't have the skills, tools or don't want to do it yourself.