6. You see your job search as personal and private. When you're out of work, job searches aren't like religious journeys—they don't require selective communications with thoughtful and generous people. Instead, they benefit from openness and candidness with everyone. Julie O'Malley writes at the Pongo Resume blog that job seekers have "nothing to lose by spreading the word and getting your loved ones working on your side." You should be willing to talk to the grocery bagger—or to your neighbor's sister's husband's cousin. You never know who they know. Don't judge their usefulness, and don't be too proud to share.
7. You assume you know corporate culture. Maybe you're young and you think that employers will care more about your résumé than your clothes. Maybe you're older and you think that the best way to follow up after an interview is with repeated phone calls to the hiring manager. Corporate culture is important. Michael Wade of Execupundit.com says one of the key questions interviewers need answered is: "Will this person fit in?" The best thing for you to do is ask—ask about appropriate dress at a company before you go into the interview, or ask the hiring manager how you can best follow up about the position.