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Article:

Successful Job Transitions, III: Starting a New Job

Take time to know who your friends are

Don't confuse others' enthusiastic welcome with a genuine concern for you or your wellbeing. That is not to suggest the people who rush to embrace you aren't sincere, it's just that you'll have no way of knowing.

You are at your most vulnerable when you start a new job. That doesn't mean you have to be paranoid, but being guarded is the best strategy until you know what's what.