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1. Don't expect people to say "Thank You". No matter how brilliant you think you were in fixing the problem or how much time you spent, they wouldn't understand (or care).
2. Expect to be noticed only when something goes wrong! Like a plumber, no one notices until the toilet backs up. Then it is an emergency.
3. Whatever schedule you set for yourself on any given day, expect someone else's agenda to supercede yours.