Failure is not about insecurity. It's about lack of execution.

All things being equal, people want to do business with their friends.

Take your job seriously, BUT don't take their complaints personally. If you take it personally you'll get upset and lose your edge. If you take it too personally, you'll lose your edge and your job. If you take it seriously -- it's you with them. If you take it personally, it's you against them. What steps can you take to ensure keeping your cool?

Don't dwell on the problem; concentrate on the solution.

Negative people are worse than negative occurrences. The argument is over in ten minutes - the person may hang around for years.

Use your CRM to retain customers.

Invest time, don't spend it.