Hiring a professional copy editor or proofreader offers benefits such as expertise, objectivity, saved time, and improved quality, while doing it yourself offers benefits such as cost-effectiveness, flexibility, greater control, and a learning opportunity. The appropriate choice will depend on the writer's budget, preferences, and writing needs. Hiring a professional is a great option for those who want to improve the quality of their writing and have the budget to do so, while doing it yourself is a great option for those who want to save money and improve their writing skills.