Like the joke about how you get to Carnegie Hall, hills require practice. I am lucky to live in a hilly area, so I can plan routes where I just ride up and down hills for 20 miles if I need the training. In the 'hood where I live I can ride in a circle up and down the same hill over and over. There's a limit to how fast I try to go because I'm not a fan of triggering asthma attacks, but hill repeats do make me a little faster and they make the hills easier.

Is there anyplace you can do something similar?