It amazes me how many people have been out there looking for a job for quite a while—either full-time or while already working—who have never asked anyone for help. Granted, some people just don’t have the resources to hire a resume writer or job coach, but there’s no excuse for anyone to be sending out resumes that haven’t been proofread by at least two other people. Even people who don’t proofread professionally are likely to pick up errors that you’re missing—simply because, as professional editors will tell you, “you’re too close to it.”
If you think the interview process is where you’re getting tripped up, ask an honest friend or colleague to conduct a mock interview with you. You may be doing something seemingly insignificant—like nervously laughing between answers—you’re just never going to realize on your own.