Don’t take our word for it. If you really care about your writing, you will ask someone else to read what you’ve written.
Consider what Daily Writing Tips had to say about proofreading:
You will be amazed at the mistakes you’ve missed. A second person will also be in a better position to evaluate whether the sentences make sense or not.
Interestingly enough, even the world’s best writers have editors. So why do it alone? Your words are too important not to double check.
Source: Daily Writing Tips