I decided to take a bit of a head start yesterday to check the lay of the land, so to speak, since this is definitely not my usual genre. I didn't get very far, but it's not a very long book, and it pretty much hooked me from the beginning.
Like Mike, I already like Mattie so much. Her narration is both tough and naive and her voice is extremely distinctive. I find her believable, when I put her in her proper context. I haven't met Rooster Cogburn yet.
True Grit, and John Wayne Westerns in general, had a lot of air play in my childhood home, so I know I have seen it and probably more than once. I'm not sure if I remember it or not - it's possible that scenes will trigger my memories depending on the faithfulness of the adaptation.
Anyway, I'm going to settle in and read for a while. It's rainy here today, and is a perfect day to spend puttering.