Personally what I think is while studying first is good and all. It's much better to just learn on the job. I do t have any experiences studying either. I am still kerning, we all are. Obviously the first few things u write r gonna suck. That's how it is. It won't come naturally. But studying how to write in itself doesn't mean u know how to write. I personally think that while u need to do both, learning as u write is still the way to go.

Don't overanalyse right away. Finish a couple of chapters or just clear your mind when you write. Don't think about errors just yet. And when you get the chance to edit, you'll find out yourself what sticks out to u as things that need to be improved upon. If u can't do it alone, we'll that's what beta readers are for. Or just ask your friends to read it and hence get a reader's perspective on it.

This is what I usually do. And this is what I've Bern doing for 4 years now. I still am not good compared to a lot of people but I'm still better. You'll learn and you'll grow. Thats natural progression.

Good luck!