Navigating a new workplace is rife with pitfalls that can set the tone for your entire tenure at a job, according to Hannah Seligson, author of New Girl on the Job: Advice from the Trenches (Citadel Press, 2007). Seligson was herself laid off from her first job a small Manhattan consulting firm. She says she bristled at doing busywork all day, but never had a clear sense of her job description at the outset, a common mistake among new hires. Here are her five biggest mistakes freshmen employees make when starting a new job.