I really can't imagine that your approach will be that different for the run, once you are actually running, than it has been for the 5k/10k races that you've run recently. You know what kind of times you should be able to hit, you have an idea of what kind of early pace you'll want to set, and you'll likely push yourself hard down the stretch to close in a manner that honors your preparation and the first 90% of your run.
If you were going to be spooked by the last half marathon you've had plenty of races between now and then for it to really rattle around your head. Instead, you've attacked your running and trained to put up a strong performance this time around.
Not that you needed a pep talk ... just get healthy and this will all take care of itself. And remind me of this next month when I obsess a little too much about PR's heading into my next race
