As I’ve learned… No one knows “enough” about grammar. This causes a lot of people to feel insecure and alone, as if they’re the only ones whose grasp of the language is less than adequate.
— June Casagrande
Don’t let the fact that you have not entirely mastered the rules of the English language stop you from writing. The rules are not really so cut and dried to begin with, and the ones that are can be easy to master. Once you understand the tips found in every “Motivation” post of this section of the blog, you’ll automatically increase your knowledge. There is a whole cottage industry of books on grammar just waiting to be read, each of which offers sound advice. I know; I had to read a few to write these posts.
While good grammar is important, there are plenty of writers who spit directly in its face. Some writers choose to write ungrammatically for effect; others don’t know better and get away with it. Still others make mistakes, even when they think they know it all. If your goal is to be published in books or magazines (and possibly on the web), there is always at least one backup grammarian on staff: they’re called copyeditors, and they’re happy to help make you sound even better.
My advice is to think creatively first, and then worry if you’ve written it correctly. Chances are that you’ll capture your audience with your wit and prose, and the style will follow.
One word for mastery: Consistency.