To be precise - I did one hill... but I did it ten times. :) A friend recommended doing some drills that involved running up a hill for about ten seconds, and walking back down, ten times. I warmed up by running on the Spring Water Trail for just a mile and then went back to the Main City Park and attacked a hill I saw the high school cross country team using for their drills earlier in the week.
It definitely helped build my confidence. Somehow, running up a hill feels a lot more productive than walking up the same hill. Not sure if that's true for anyone else, but I'm going to stick with it!