5. Don't blather.
"When I was in the corporate world, I had an interview candidate that would rattle on and on, nervous and wanting to fill empty space," says Arden Clise, a Seattle-based business-etiquette consultant at Clise Etiquette. "He said things he probably didn't want me to know," she says, such as the fact that he'd yelled at his boss and been fired.
Clise advises clients to answer an interview question and then stop. Silent pauses are acceptable and allow you and your interviewer to compose your thoughts.
6. Don't show up late.
Levit relates the story of a candidate who appeared a half-hour late. The interviewee then revealed that she wasn't on time because she had been across the street, waiting for her meeting at a competitor's office. Map out the drive to your job interview location online or perhaps even rehearse the route. Plan to show up at least 10 minutes early with extra time built in for wrong turns or parking snafus.
7. Don't complain about a past job or previous employer.
If you criticize, the interviewer may think that in two years, you'll be bad-mouthing the job they give you or trash-talking the company, Levit says.
"People don't appreciate that," she says. Instead, speak respectfully and act like a positive person in the interview -- someone that anyone would love to hire as part of a team.
8. Don't underdress.
People go into every interview with assumptions about the company culture. Perhaps you've heard that "casual Friday" runs all week. But even if your interview team is in jeans and T-shirts, selecting finer threads won't hurt your chances, Levit says. It also communicates that you take the job and the interview seriously. Wear the best suit you own or can afford and cover any body piercings or tattoos.
9. Don't reveal your mistakes unless necessary.
If you make a misstep (coughed through your job interview, called your interviewer by the wrong name, took cold medicine too close to the interview time), apologize in a follow-up email or in your thank-you note.
If it was a serious transgression, you probably blew your chances. But don't grovel or become overly apologetic. Even if it felt like a big deal to you, your interview team often won't notice smaller gaffes, Levit says.
10. Don't offer a sweaty, limp palm.
"When discussing handshakes with my clients, they share that their No. 1 turnoff is a sweaty, dead-fish handshake," Clise says.
Why? Because you have a visceral encounter with how nervous the other person is, Clise says. Keep a tissue in your pocket or purse, so you can wipe your hands dry right before you go into the job interview, she says. Make sure your handshake projects confidence, even if you have to practice that palm-to-palm greeting with an honest friend.
"We want to choose a winner, and we want to see them succeed," Clise says. "Smile, act confident and nail the interview."