So basically if you want to work on your vehicle, you need a second vehicle. That was basically the reason I could never get behind doing work on my own car.
"Backup transportation solution", it can be public transit, or even a bicycle if it's enough to get you where you need to, but yes that's my opinion.
Even something as simple as an oil change can go wrong. Drain plug broke and you need a new one? Or you forgot to put a gasket and it leaks and now all your oil is on the floor? Well, now you need a trip to the parts store, or order it and wait until parts get there.
In my case, it was a routine maintenance operation: changing brake fluid. I used a power bleeder, and at a third of the pressure specified on the manual, the reservoir ruptured. So now I needed a new reservoir. Parts store didn't have it, and it took 2 weeks to get there.
Indeed. In this particular situation it cannot happen since that reservoir is normally not under pressure, but I've had a not properly connected line (my fault) disconnecting while performing an unrelated operation.
Luckily that one was just a quick trip to the parts store to get the right fluid and reconnecting the line properly this time!
This is a great example; said friend also convinces you to stay hydrated, double check your safety, and not just apply more force in the wrong situations.
I once took 3 Ubers to 3 different auto parts stores; I've biked to a stores. I've borrowed neighbor's cars.
It's also rare to order too many parts or tools. Rental tools are very useful, but many times as a car ages, you may need to order other parts.
Though I don't get this complaint; because there is often lead time at a mechanic's for the parts too; you still need a backup transportation plan for that situation. (And it's even more likely to effect you during a 9-5 if you your wrenching on weekends or weeknights)