You've decided you have a story to tell and you think others will enjoy reading it. You have everything you need in your hand and in your head. You're determined and you're absolutely positive that you can do this. You saw 'Field of Dreams', so you know that if you write it, they will come. (Or cum.) Spell it your own way. It's your story.
Hey, you're prepared. You've been lurking around reading stories for years. Now, you've even taken the first step of creating an account, reading the rules, and possibly, you've visited the Author's Hangout to see what little tips you could pick up before you ever begin writing your first story. That's a smart move. It's a safe bet not many new writers think about doing that before they submit their first story.
You tell yourself there's nothing to it. Some of the stories you've read were not even edited and they came off badly. The readers tore them apart in their comments. But, you at least know better than to make those silly little mistakes in grammar and spelling. You took four years of English in high school, and you remember most of what you learned. You know when to use 'who' and when to use 'whom'. You even know not to end a sentence with a preposition. (Wait! What's a preposition again?) There it is. That first little nagging doubt.
No need to make yourself look ignorant by asking that one on the boards. Google it. Okay, you've got it now. So, how do you rewrite that sentence that ended with a preposition? Hmm. You'll have to give that some more thought. Sleep on it. It will come to you after you're more rested.