I don't have a full understanding of how every single part on this automobile works.  I can't tell you the exact science behind a heater core, or could draw a legible and accurate depiction of how a clutch, flywheel and transmission dance during a downshift.  

I am guilty of becoming an expert only for a day until the part is fixed.

This probably isn't a good personality trait.

King for a Day Fool for a Lifetime