What kind of mental approach should I take for a one mile race?

On a whim, I signed up to run a one mile race next weekend.

I started running a few years ago with a goal to build distance, and I have never cared much at all about my pace. I've done a handful of 5ks/8ks/half marathons, all fairly slow, and kept a consistent mileage of around 20-25 mpw between races for a couple of years now.

I realized recently that I've never actually tried to run all out for a mile as fast as I could. Looking at previous year's results, there's actually a decent chance that I could place for my age group in this race, so I'd like to go for it.

What race strategy advice do you have for someone who has never actually tried to run fast at short distance?