Hi Phil,you sound like me, right down to the first race nerves!.I've just entered the Great Welsh Run (5 miles) May 5th....and I can't even run for 30 mins yet.I've got 3 weeks to improve a bit & I am a bit worried about coming last, I'm not convinced I won't be, but I've been told its OK to walk/run & to concentrate on increasing the length of time out on my walk/runs, rather than going faster.And apparently if you are going to walk/run the race, its better to keep it constant i.e run 5 mins/walk 2 mins all the way, rather than overdoing the run bit at the start.When you get nervous, try thinking about how good it will feel just to finish your very first race, and about how much you have improved since you started out.(thats what I'm trying, anyway!) You say you're not very fit, but you've just done 5 miles....thats way better than me! Good luck
Gill