For me it was “buy high quality pillow” because you sleep for one thrid of a day etc. I needed a new pillow anyway so I came to the store and bought the best they had. And it was … ok. Like it’s a fine pillow but my sleeping haven’t improved really, it’s basically the same. So I was disapointed :(
So, which life pro tip disappointed you?
In my country if you buy used from a dealer you get 1 year warranty by law. Makes it pretty safe, especially if you have the car checked by s trustworthy mechanic (finding one is the hard part!)