You might be surprised how many people don’t do what should be obvious preparation for face-to-face interviews. You can mess up an interview by doing any of these things:
Be late: there are valid and invalid reasons. Call ahead and explain. Prepare in advance by getting contact names and telephone numbers. Know exactly how to get there; do a dry run if possible.
Be odorific: Avoid this by practicing good hygiene. Avoid things that create bad breath. Alcohol, smoke and food seasonings like garlic on your breath will make you unattractive.
Dress inappropriately: Only lost luggage can explain away this one.
Be totally unprepared for the questions: There are standard types of questions. Prepare with practiced answers. Practice out loud with video if possible. Listen to what you say, how you say it and watch your body language. Learn from it.
Make politically incorrect comments, swear, be negative, berate your employer, don’t smile, and talk too much (monopolize the conversation) during the interview: These things will end your chances quickly and it should be obvious to avoid making them, but given things I have heard in interviews, I wonder how obvious.
Karl has been reviewing resumes for people at no cost since 1999. He has been counseling job seekers since that time as well. If you would like his help, email him at email@example.com