3 truths about fixing things:
(1) It generally takes longer than you think.
(2) You develop a deep understanding of the dysfunctional nature of large organizations (if you deal with customer service) or of user manuals.
(3) You develop a lot of appreciation for how smooth things are when they do work. If this emotion is channeled well, you might just walk out of the experience a more grateful, and thus a happier, person.