My dad was a mechanic (who had a pretty lucrative day job) who spent almost every weekend helping people who thought they knew what they were doing, undoing their DIY car and truck "adjustments". Sometimes he would spend several hours fixing and readjusting timing or carburetor issues, only to have the car's owner readjust them later. When the owner realized they'd put their foot in it- again, they'd return the next weekend. While he was very patient, there were people he would no longer answer the door to after a while.
There's a reason why people train years in various trades.
That said, I have bought instruments that had had amateur set ups, pickup installations, and I have to say, it's frustrating to have to deal with jammed truss rods, chipped finishes on the butt of guitars where someone thought they were skilled enough to ream the endpin hole to install a jack plug, and a variety of finish issues due to someone using a hair dryer to remove a pickguard. I have seen some real travesties.
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