The thing that helped me most with hills is gaining the quad strength to be able to climb standing- all the way on smaller, not so steep hills, and the last bit on bigger hills. You can practice on flats. I do little sprints- stand, pedal at what feels to me like a nice "running" cadence until I feel the very beginnings of lactic acid in my quads, coast, still standing, until legs feel ok or until speed drops to say two or three mph less that what it was pedaling, repeat as many times as I can take. Also, stand for a change of position every 15 minutes or so on any ride. Being able to stand and not die right away is like having an extra three gears. (So, when you really do stand on a hill, shift down about two gears while you are still sitting, then stand and enjoy how easy it seems!) I am _not_ a fast climber- probably weight-related, but I'm working on that!
Nanci
***********
"...I'm like the cycling version of the guy in Flowers for Algernon." Mike Magnuson