In a moment of madness I entered a 5K before I really began running, although I was doing a lot of hikes and cycling at the time, afterall I thought kids run about all the time - no problem how hard could it be?! It all became apparent about 2 mins in that it could indeed be hard! You are much wiser and have already done some training and don't worry about not having done the distance you don't with marathon training either, the event takes you through the last bit. I was certainly hooked though after my first fool-hardy experience and really enjoy hill running, which I also thought I'd never manage. That first 5k T-shirt is one of the proudest ones I have and I can still remember every step of it! My time was 35 mins then and now I can get just under 22 min on a good day so whatever your time this time it can only get better from here on in
Enjoy x