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A interview (especially for a sales Job) is actually a sales call where you are the product! You can apply everything we have learned about selling to help stand out ahead of the other candidates.
One of the keys to developing any skill is your ability to apprise your performance and make adjustments. In a professional Sales Job your company and management will expect you to be able to engage in a review process and demonstrate that you are making progress. This Video discusses the competency model and set some expectations around your attitude to improvement.