Content is still king in this world. You need to know how to present your abilities in their absolute best light, and in their strongest form. It's not just what you say, but how you say it that counts.
There are advantages and disadvantages of the 3 major ways to write and edit your own resume. The first one is, it's hard to edit your own writing. The second one is, your SO may not know the terminology of your field. The third one is, a career coach represents an investment.