I did a 10km race a few years ago (it was a goal and I have never run since) - ha ha. I managed to not die and complete it in 1 hour and 14 min 13 seconds (Ya the time is ingrained in my mind even though it was years ago - probably because my body keeps telling me "Don't you EVER do that AGAIN!
Here is a tip I had learned...consume lots of liquids up to the 5km point...after that, you body won't be able to use the water you drink for the rest of the run (obviously drinks lots when you are done).
It felt awesome to meet a goal but I knew I was never going to be a long term runner as I have knee problems... so even though I jest, please don't think that it was really that bad because it was not...I did 10 and 1's (run 10 min, walk 1 min)...and you are in better shape than I was so just run your own race...if you get a chance, look over the last 1km of the race a day or so before...so you can choose a marker to indicate when you are really going to give it everything you have to the finish line - that is when I imagine the crowd was cheering
just for me, I tell myself it is now or never and anything left in the reserves is going to be USED UP!
Tell us the date and time and I bet you will have lots of people sending you good vibes!