Obviously, you know what is on your resume, right? Not necessarily if you had someone else write it and you do not review it very carefully. Keep in mind that many facts large and small went into the shaping of your winning resume. When the time comes to sit in front of a hiring manager for a face-to-face interview, you should not be hesitant about which facts made it onto your resume and which ones did not. Chances are your words will not be in sync with your written resume if you are not thoroughly familiar with exactly what your resume says. The best way to be on top of those details is to write your resume for yourself.
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Unless you learn how to make a resume, it will cost you lots of money for a skill that you really need to know first-hand. With the right reference materials, the essentials of resume writing can be learned in an hour or two. I offer an excellent book on this topic at my website, if I may say so myself. Of course, as you know, you can also visit almost any bookstore to find several other books that will bring you up to speed.
As an example, lets say at your current job you have been called on to handle a wide range of tasks - and you have carried them out exceptionally well. The problem is, you may not want to list all of those responsibilities in a single resume. That might give the impression that you are not focused on any particular expertise and that may put you at a disadvantage. Better to research what skill sets and what role the company you are interested in is looking to fill. Then, tune your resume accordingly. Takes more time? Yes. Gets better results?