I think it's a matter of substituting "you" with "any person competent with the necessary non-specialized tooling", where competent means "able to follow a serv

I think it's a matter of substituting "you" with "any person competent with the necessary non-specialized tooling", where competent means "able to follow a service manual", and obviously "non-specialized" excludes expensive brand-specific one-off tools. Cars are a mixed bag, because on one hand you have OBD2 and lots of parts can be easily ordered, and on the other hand you have un-obtainable parts, manufacturer-specific code and special tooling (even when there is no business putting custom stuff). And they are also becoming less repairable and have a lot of mechanic-hostile design (it's a meme in the industry). I have some insight in that because I have actually started repairing cars as a hobby, including non-trivial stuff.