Overall, I did 2.4 miles with three walks and felt pretty discouraged as I hadn't even tried the really challenging hill part of the run. I'll probably be repeating this brick this Sunday, but I've got to try some less challenging bricks, too.
Keep doing it... it will get easier!

A few months back, riding 25 miles and running 2 miles liked to kill me. Now, riding 30 miles and running 3 miles almost kills me!

See, it gets better!