Yesterday, I ran Week 3 Run 1, and I was nervous about running for 3 minutes, since I had completely collapsed after 90 seconds last week. I again took your great advice and walked up the big scary hill at the beginning (rather than running). And I ran at my super slow "slightly bouncy walk" pace.
And it worked! I know I could keep that up as long as I need to. I just need to resist the temptation to really "run" fast, and stay on my gentle stride. It was an awesome feeling.