I'm a believer in the only way to get better at hills is to consistently do hills. I do a ride with hill repeats 1x week. Also, like others have said, increasing cadence helps on hills. Spinning faster and easier rather than slower and harder. I'm one that enjoys getting up out of the saddle on hills, but most times I reserve it for when I'm getting closer to the top. The clipless pedals will also be a benefit.