Attitude. One word, with a big punch, and some make or break connotations for your career. How many times have you heard people extol an employee for their great attitude, no matter what, or condemn them for having a bad attitude when, by all accounts, the rest of their work performance was fine? Attitude, and other people’s perception of yours, plays a big role in the workplace.

Research suggests that 85% of job success can be “determined by ‘attitude’ and the ‘ability to deal with people,’” according to the Carnegie Foundation. Combine that with our own anecdotal evidence of people’s perceptions, and you can see how important a positive attitude is for any career—but especially in sales, where your “ability to deal with people” is critical.

Attitude in Job Interviews

Attitude is also a major factor when interviewing for a job, in any industry. Knowing all this, it seems logical that anyone pursuing a career in sales would invest in some sort of “attitude adjustment,” but that’s where it becomes tricky. What qualifies as a legitimately “bad” attitude, and what can be chalked up to personality differences? Can you be realistic, or even pessimistic, and maintain a good attitude?

We’ve all heard horror stories of customer service representatives who put their company to shame and inspire nothing but laughs at what they call “service.” But everyone has bad days, head colds, breakups and personal problems. The difference between a great salesperson and an average one really does come down to attitude: who is able to rise above a bump in the road, and who cannot.

Fake It ‘Til You Make It

You don’t have to be an Oscar winning actor to succeed at work, even when you’re having a bad day. You just need to put things in their place and focus. Bringing your personal life to work can be beneficial when it allows you to connect with customers, but on a bad day, you may need to focus just on the 9 to 5. Prioritize, organize and by all means, slap a fake smile on your face—it really can help. Then take a deep breath, and focus.

The ability to segment two parts of your life in order to regroup and refocus on one will help tremendously on bad days, but it can also have residual effects on everyday performance, giving you the edge you need. When you’re able to put yourself aside and focus on the person you’re talking to, you can’t help but do a better job. Whether you’re in sales, customer service or hospitality, people like to feel that they are the center of attention. And when you give them that sense, you’ve automatically done your job a little bit better.

Try it out: give yourself a mini attitude adjustment, and see your performance improve.