The only ones that get easy, are the ones you ride often, and when they do, you look for another challenge, and then another and so on........ And then you do combinations of them, with longer distances between, or with less time between, always wanting to push yourself to the limits, using higher gears or aiming for faster times, its endless.
One hard hill I finally conquered by wearing my "Columbia" shirt, I was too proud of my shirt to be seen stopped by the roadside, so I pushed hard all the way.
"...you don't fly up a hill. You struggle slowly and painfully up a hill, and maybe, if you work very hard, you get to the top ahead of everyone else."
--Lance Armstrong