As a Last Year's Newbie I am still learning to do most everything. But, where I ride hills are unavoidable. My two mantras are:
>Patience. Don't try to go faster to get it over with. Don't "attack" the hill. Just keep pedaling.
>Don't feel bad if there is a need to stop for a break and a drink before the top. This isn't a live or die matter for me. It is something I do for fun and fitness. Besides, a stop half way up today is a stop 3/4 up next week and all the way up the next. Then after a few trips I can feel great that my times are getting shorter and my distances are getting longer.