Did you get your ticket yet?
I always get my ticket a couple weeks in advance, now would be the perfect time to make sure you actually get a seat.
If you have your ticket I'd say go around 10 or 10:30, even if you have to stand in line for a little bit, it'll go fast, especially if you're with a large group, but at least you're making sure you're getting a good seat.
I've gone to the midnight showings every movie since the third and that's about the time I go. I have never had a bad seat lol and the sad thing is, there is usually a line there already, so I'm not the only crazy one going super early, but it's usually not that long of a line at that time.
Good luck getting a good seat :)
hope this helps :)