The main issue with a resume DIY is that you have never been trained on how applicants are screened today. Years ago, when you wrote your resume, you listed your job duties and someone took the time to read it. Now, technology has taken over the initial screening process. The resume software referred to as ATS scans your resume for very specific information and then it ranks you. Nobody will see your resume if it is not optimized for the system which includes specific content that is strategically placed, key words, skills, formatting and readability.
Keep in mind, you are competing with hundreds if not thousands of applicants. If you do rank well, you must pass the 10 second glance which is the average a Recruiter or Hiring Manager spends scanning your resume. A professional resume can set you apart and truly showcase your worth.