I will tell you that your friend is most likely 95% correct. This is my experience, my daughter and I did the Tink 10K in May our first, first Disney first 10K, I had run a few 5k before that , at roughly 45mins, so I was in our shoes. I had put a 13min finishing time when I signed up, as I really thought I could get to that point by the time we did the race since you sign up so far in advance. I ended up hitting a brick wall so to speak with my training, so never really made it to that point, I was lucky I could do the 15min( shin splints, shortness of breathe, you name it) we were far enough up in the corrals, I think there were 2 behind us, that we were able to run?walk the race and still stopped for a few pictures( not the characters , but in front of the castle, etc), and we finished it in front of the balloon ladies. My other fear was I had never managed to ran past 4miles. so Fast forward, it's now August and I'm training for the Wine and Dine 10K, I'm up to about a steady 14min mile for the most part on my 5K's, but I feel as long as I continue to train using galloways 10K plan, I will be in a much better place, then I was in May, but still worried. But I can say I did the Tink 10K and had fun, so keep training( don't over train) and you will be fine. Just remember it's about getting to the end, not how fast, we have 2 1/2 months to add the miles, right now I believe with galloways pln, this coming sunday is only 3.5miles.