Self-belief & confidence is essential, however not necessarily for the reasons you think.

Employers like people who believe in themselves as they are more likely to come up with solutions not complaints. They’ll say “I’ll figure it out” instead of “this can't be done.” They possess the positive mindset to think of solutions and answers to problems. Rather than looking for excuses, these progressive people work toward achieving their goals with gusto and enthusiasm. This is important to most companies so candidates may benefit from mentioning this during an interview.

Employers also like people who are confident as they act with clarity, purpose and bring an element of excitement. This, in turn, attracts others to join aboard, which will further accelerate their chances of success. Inwardly, they may be a little frightened and harbor some doubts, but they persevere despite these feelings.

Another key pull towards those candidates who are confident is that they aren’t afraid to say that they don’t have an answer and ask for help when they need it. They reciprocate by mentoring and lifting up others. You’ll notice that intrepid people speak with authority, calmness and enthusiasm. There's no trash talking or demeaning others. They understand that there will be conflicts, setbacks and haters, but that won't intimidate them. This stands you in good stead when working in a team and in a new position in a company, all valuable assets from an employers point of view.