Here is an excerpt from an article written by Amy Gallo for the Harvard Business Review blog. To read the complete article, check out the wealth of free resources, and sign up for a subscription to HBR email alerts, please click here.

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Very few people succeed in business without a degree of confidence. Yet everyone, from young people in their first real jobs to seasoned leaders in the upper ranks of organizations, have moments — or days, months, or even years — when they are unsure of their ability to tackle challenges. No one is immune to these bouts of insecurity at work, but they don’t have to hold you back.

What the Experts Say

“Confidence equals security equals positive emotion equals better performance,” says Tony Schwartz, the president and CEO of The Energy Project and the author of Be Excellent at Anything: The Four Keys to Transforming the Way We Work and Live. And yet he concedes that “insecurity plagues consciously or subconsciously every human being I’ve met.” Overcoming this self-doubt starts with honestly assessing your abilities (and your shortcomings) and then getting comfortable enough to capitalize on (and correct) them, adds Deborah H. Gruenfeld, the Moghadam Family Professor of Leadership and Organizational Behavior and Co-Director of the Executive Program for Women Leaders at Stanford Graduate School of Business. Here’s how to do that and get into the virtuous cycle that Schwartz describes.

Preparation

Your piano teacher was right: practice does make perfect. “The best way to build confidence in a given area is to invest energy in it and work hard at it,” says Schwartz. Many people give up when they think they’re not good at a particular job or task, assuming the exertion is fruitless. But Schwartz argues that deliberate practice will almost always trump natural aptitude. If you are unsure about your ability to do something — speak in front of large audience, negotiate with a tough customer — start by trying out the skills in a safe setting. “Practice can be very useful, and is highly recommended because in addition to building confidence, it also tends to improve quality. Actually deliver the big presentation more than once before the due date. Do a dry run before opening a new store,” says Gruenfeld. Even people who are confident in their abilities can become more so with better preparation.

Get out of your own way

Confident people aren’t only willing to practice, they’re also willing to acknowledge that they don’t — and can’t — know everything. “It’s better to know when you need help, than not,” says Gruenfeld. “A certain degree of confidence — specifically, confidence in your ability to learn — is required to be willing to admit that you need guidance or support.”

On the flip side, don’t let modesty hold you back. People often get too wrapped up in what others will think to focus on what they have to offer, says Katie Orenstein, founder and director of The OpEd Project, a non-profit that empowers women to influence public policy by submitting opinion pieces to newspapers. “When you realize your value to others, confidence is no longer about self-promotion,” she explains. “In fact, confidence is no longer the right word. It’s about purpose.” Instead of agonizing about what others might think of you or your work, concentrate on the unique perspective you bring.

Get feedback when you need it

While you don’t what to completely rely on others’ opinions to boost your ego, validation can also be very effective in building confidence. Gruenfeld suggests asking someone who cares about your development as well as the quality of your performance to tell you what she thinks. Be sure to pick people whose feedback will be entirely truthful; Gruenfeld notes that when performance appraisals are only positive, we stop trusting them. And then use any genuinely positive commentary you get as a talisman.

Also remember that some people need more support than others, so don’t be shy about asking for it. “The White House Project finds, for example, that many women need to be told they should run for office before deciding to do so. Men do not show this pattern of needing others’ validation or encouragement,” says Gruenfeld. It’s okay if you need praise.

Take risks

Playing to your strengths is a smart tactic but not if it means you hesitate to take on new challenges. Many people don’t know what they are capable of until they are truly tested “Try things you don’t think you can do. Failure can be very useful for building confidence,” says Gruenfeld. Of course, this is often easier said than done. “It feels bad to not be good at something. There’s a leap of faith with getting better at anything,” says Schwartz. But don’t assume you should feel good all the time. In fact, stressing yourself is the only way to grow. Enlisting help from others can make this easier. Gruenfeld recommends asking supervisors to let you experiment with new initiatives or skills when the stakes are relatively low and then to support you as you tackle those challenges.

Principles to Remember

Do:
Be honest with yourself about what you know and what you still need to learn
Practice doing the things you are unsure about
Embrace new opportunities to prove you can do difficult things

Don’t:

Focus excessively on whether you or not you have the ability – think instead about the value you provide
Hesitate to ask for external validation if you need it
Worry about what others think — focus on yourself, not a theoretical and judgmental audience.

[To read the complete article, including two especially informative case studies, please click here.]

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Amy Gallo is a writer and editor. Her work appears on HarvardBusiness.org. For eight years, she worked for the management consulting firm Katzenbach Partners (now Booz & Company). At Katzenbach, she authored the firm’s report on the Informal Organization, featured in Fortune Magazine.