We are looking for people with a passion for grammar and the English language, so even if you don't think you have enough experience, you should still apply! No one knows everything about grammar (there are too many rules!), but if you're willing to research, you have more than enough knowledge to join the ranks of Fandom Grammarians.
We're still keeping an eye out for applicants who have been educated in non-American usage of grammar, but don't let that stop you from applying. Passion is required, spelling color with a 'u' isn't.
For more information please see the Application Post.
And if you have any questions about the process, please ask them here.