Me, I love rewriting. That's where the story comes alive and takes real shape, and I feel like I'm finally in control. Well, I love it the first couple times. After that, it's just hard work, but that's a necessary part of the process.
One trick, beyond learning the fundamentals as others have said, is to break the revisions down into stages. Don't try to fix everything in a 400-page novel (or even in a 30-page short story) all in one pass.
My first draft just gets the basic plot and characterization in place. Then, I do the next draft just to fill in all the blanks I left in my gappy first draft, and don't worry about the grammar, spelling and individual sentences much. (Although I do have those skills when needed, and I'm not suggesting you can skip learning them, just that it's pointless to spend huge chunks of time perfecting a sentence that will be deleted when you determine that the entire scene it's in needs to be cut or rewritten from scratch.)
Another pass through the manuscript is for theme, which I don't usually have a thorough handle on until after the first two drafts, but at this stage, I can rework some scenes or add/subtract scenes to emphasize the theme and remove conflicting themes. For other people who are better with theme, this stage might be something like characterization, making sure the character sounds and looks the same throughout. Or whatever other aspect that's known to be a problem.
Then another pass is for grammar and sentence rhythm and missing words and blue eyes in chapter one that become green eyes in chapter twenty.
And once I'm satisfied with all those previous revisions, I run the spellchecker AGAIN (I do it frequently, to get rid of as much as it can help with, freeing me up to fix the things the spellchecker can't fix) to catch the stuff that spontaneously generated during my previous revisions and then do one more pass through it for anything -- plot, grammar, structure -- that irritates me as I read.
If I were a more virtuous author, and one who didn't "hear" the discordant words/sentences in her head as she reads, I'd follow the really excellent advice to read the presumed final draft one more time aloud, looking for clunky sentences and other stuff missed on previous passes.
JD