I have just completed week 3 run 3 and it was my first run outside, it was awful.
I have been using a treadmill set to an incline (as read on here that was best) but nothing had prepared me for the outside world. I had begun to really enjoy the programme and looked forward to my treadmill sessions, I have been running all over the world thanks to the iPad and wonders of treadmill scenery videos on YouTube.
I found the first week tough going and repeated it but then I enjoyed the last two weeks until today. I kept my speed down, took steady deep breaths, I am thinking of repeating week 3 but perhaps do it all outdoors to acclimatise?