So I started my first week this week and finished the third run today.
First run was okay but got a stitch half way through, had a headache at the end due to dehydration, and my legs were aching for the next two days. The second of which I was doing my second run which, surprisingly, went quite well. Felt a stitch coming on again halfway but it subsided this time and actually felt really good about the run. It was already around a minute faster than the first day's average.
Today however, when I did my final run of the week, the start felt fine, but once again got a stitch halfway through, and was slower from there than the last run. I didn't feel great when I got back and actually felt a bit dazed. On the upside, my legs are feeling okay now.
All in all, I'm happy I've completed my first week, but it is going to be hard going for the next 8 weeks if I continue to get a stitch halfway through.