on Writing Forward:
The human mind is a funny thing; it likes to play tricks on us.
For example, when we proofread and edit our own writing, we tend to read it as we think it should be, which means we misread our own typos and other spelling, grammar, and punctuation mistakes as well as problems with word choice and sentence structure, context, and overall readability.
If you have a friend or family member who has good grammar skills, maybe they can help you by proofreading and editing your work before you send it out or publish it.
For special submissions and publications, hiring a professional proofreader or editor is the best way to make sure your writing is free of errors.
But for most of us, it’s not likely that anyone’s going to proofread and edit every single piece of writing that we create. That’s especially true for writers who put out a lot of material — like bloggers. Proofreading and editing services can get expensive, and friends and family probably don’t want to spend all their free time checking your work. Sometimes the only option available is to do it yourself.