You'll toughen up physically and mentally as you progress through the season. Hills are friends and you'll notice this at some point. Over the course of time you will develop your own riding style. Most of us like to slip back in the saddle a little and let the glutes and hams take some of the load. As you approach the hill you want to initially be shifting down on the chainring only and then find the gear you want according to the steepness, wind conditions and your energy stores.

I have a 12sp so it's easy. I approach on the tall chainring and on the #3 gear of the freewheel so when that starts to get tough I just slip off to the smaller chainring and it's right there, no change in cadence or difficulty....of course at that point speeds are declining with the incline.