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Two of my favorite online grammatical resources: Grammar Slammer and Holy Mother Grammatica.
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If you still feel like you struggle with this technical aspect of writing, find yourself a critique partner who's good at grammar. (Gee, I wouldn't know ANYBODY who has a former English teacher for a crit partner who'd be willing to help her crit partner with the grammar aspects that cause ANYBODY to fret obsessively. Just sayin' is all.)
Whether you consider yourself good with grammar, somewhere in the middle, or an abysmal mess, the trick is not to let it scare you or kill your voice. Grammar is the technical part of writing, not the creative part. But it is just as important as the creative part, because if we don't observe the conventions, our work will be unreadable to others. Just as plot, setting, characterization and imagery are tools in your Writer's Tool Box, grammar is simply another tool. Don't sweat it...just write.
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