Tools are an addiction, Im guilty of buying tools which I have only used once but it's an investment, (I'm sure I will use that dial gauge or pulley holder again at some point in my life)
My worst flop- changing a simple pcv valve on the tappet cover of my old Mazda, the old plastic became brittle and some fell through the pvc hole into the engine my fear was the plastic could get stuck between the valve springs and stop them from closing or maybe even fall through the valves into the cylinder, so I ended up striping the whole head. Probably wasn't necessary but I couldn't live with the anxiety of not knowing where those plastic bits could end up.
What I found during my DIY experiences:
1- a workshop manual is ideal, especially for the correct torque specs and diagnostic procedures. They also harder to come by for newer models or are electronic only.
2- if you don't have a workshop manual, never watch just one you tube video, some of them talk kak and the workmanship is questionable.
3- the right tools make the task so much more enjoyable.
4- at least for me, new cars are intimidating with all the electronics and wizardry that go into them, it feels like you not only need the right tools but also the right software. This can make a simple jobs difficult for DIY. VW Electronic hand brake needs to be electronically released (via cable to a diagnostic tool) before the pads can be mechanically replaced.
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