Why you can't proofread your own stuff

One simple reason. You're too close to it.

Let's say you created a piece and made some typos -- for example, some words have missing letters or there's no comma when there should be one. When you read it over, you're likely to miss the typos because your mind's eye still sees the missing letters and the AWOL comma. You know they should be there.

What you need is a fresh pair of eyes.

You need a proofreader.

The best person to proof your stuff is a professional proofreader. She's trained to catch the smallest mistakes. And the good ones will amaze you by catching things you didn't even know were there (though you were the one who created the piece in the first place). If hiring a professional proofreader isn't in the budget, ask a colleague or an administrative assistant to proof your piece. If you're as fortunate as I've been, you'll find some are just as good as the professional readers.