With several thousands of Americans still unemployed and many overworked professionals contemplating the pursuit of greener pastures, it’s easy to see why competition for jobs is fierce in most industries. Hiring managers and human resource professionals are looking for the best of the best in the resumes they receive and the job interviews they conduct. Unfortunately, there are many opportunities for job seekers to go awry. If you’d like to avoid an extended unpaid vacation from the workforce, steer clear of these four ways to ruin your chances of getting the job.

1. Submit a sloppy cover letter and resume

Employers are looking for go-getters, not candidates who put in minimal effort. So don’t submit a generic cover letter and resume unless you want yours to be among the first in the trash. Customize each piece you send for the company and position. This may mean reworking your goals, rewording your accomplishments, or even using different references. Then check and double-check your documents for spelling errors, punctuation issues, and problems with grammar. Don’t rely on the spellchecker in Word either—it doesn’t always catch what another pair of eyes will so solicit help from a well-read friend or relative.

2. Shame your grandmother

Once you make it to the interview phase, there are even more ways to sabotage your chances with potential employers. Your best bet is never to do anything in an interview that you would not do in front of your grandmother. Show respect by showing up on time. Don’t chew gum or suck on candy or mints. Get a haircut and shave. Put your best foot forward and make sure it’s not a stinky one—a shower is not optional. Make eye contact and use a firm handshake. Finally, dress professionally, project confidence, and always say “please” and “thank you.”

3. Speak before you think it through

If a potential employer asks you a difficult question (and they will), consider your answer carefully. We are not suggesting that you lie; interviewers often appreciate candid answers. However, there are some things you should never say and others that you may be able to phrase diplomatically. Avoid ranting and raving or throwing blame. If you parted ways with your last employer on less-than-perfect terms, you can still find something positive to say. Think about this ahead of time and plan out your answer.

4. Stalk your interviewer

Ask about the next steps before you leave the interview so you’ll have an idea of the company’s timeframe for hiring. It’s polite and professional to follow up your interview with a thank you note, by snail mail, or by email. It’s also perfectly acceptable to give your interviewer a call if you have not heard from him or her within the agreed-upon time. However, if your interviewer does not return your call or respond to your email, it is generally not acceptable to contact him every day or make aggressive demands on voicemail.

Every job opportunity with every interviewer is different. Use common sense within each situation and avoid these four ways of ruining your chances of getting the job. With perseverance and professionalism, you will find a new job.