I can just use the spell-checker, right?

Well, yes you can, but bear in mind that spell-checkers might not be as helpful as you hope.
Yes, they can flag up many misspelled words, but they won’t direct your attention to missing words or words used out of context. You could, for example, have written a correctly-spelled word but its meaning or context is entirely wrong:

“I red the report today and fought it was very good. I asked my colleges for there opinions.”

As a spell-checker only checks individual words, it would not find anything wrong in the above sentences. Each word is spelled correctly but, as you can see, several words (in bold) are totally wrong.

If you are typing quickly and busily, you may not notice that you have accidentally missed out a letter or a word. Don’t count on your spell-checker to notice either. That’s why it’s vital to proofread your work before you hand it in, email it or post it off. Taking just ten minutes to check your work after the spell-checker has done its best can save you further time and possibly the embarrassment of seeing your errors in print. Readers are savvy. They are generally put off by texts that seem sloppy or riddled with spelling errors.

There’s a belief that spell-checkers are turning us all into lazy, barely-literate scribblers and, arguably, this might be true. However, it could also be argued that spell-checkers have helped many people improve some aspects of their writing. It’s quick and easy to use and very accessible. But it can never replace an eagle-eyed proofreader.

By all means, let your spell-checker take up some of the slack. But don’t let it be the crutch you rely on to make your writing the best it can be. If you doubt your proofreading skills, hire a professional, experienced proofreader to do the task for you. You won’t regret it.