"I'm always amazed at how many people tell their co-workers about their job search," Kay says. "That's one of the worst things you can do." Ideally, you wouldn't tell any co-workers, but you may have to if you want them to serve as references. In that case, Kay says, "you need to pick people who you really trust, who don't have a hidden agenda and who won't let it slip."
4. Outsourcing placement services.