That's great, Lisa -- but I never doubted you could do it!
The summer before last (this summer we were too busy taking care of our new puppy and my husband's baseball team, and just not riding) we biked to the food co-op a bunch and would come home with our panniers loaded. I carried about 15-25 lbs of groceries, plus the extra weight of two racks and four panniers. Our ride home was 14 miles of mostly uphill (nothing a very steep grade but lots of gradual, long climbs). It was hot and very tiring, but we did it, and we were not particularly well trained as we hadn't been riding much prior to starting up with it. So I knew your short ride, even with the tough hill, would be doable, because you wouldn't be doing the hill after miles and miles of tiring riding -- you were still fresh, you know?
Good on you!
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow