It definitely gets easier. I've recently started training for hills, after cycling the flat for a few months I tried my
first hill, about a 9% gradient, around a 250m climb. I found it very hard work, and had to stop every 10min to get my breath. The next day
I tried it again and got a bit further, but still had to stop regularly.
Then the next week I cycled a
route around the black forest with a friend, about a 35km route with about 750km of climbing. To be honest I didn't think I'd make it. It was the hardest cycling I'd ever done, my heart rate was constantly close to it's maximum and I had to stop regularly, but being with a friend meant that we could motivate each other and we pushed ourselves not to let the other down. Despite the odds we made it. My friend told me that my body would adapt quick, and that the next time I tried it I wouldn't need to stop.
He was right, the next week I tried a
similar route, similar gradients and also about 750km of elevation gain. I could do the entire route on my hybrid bike without stopping (this included the hill I first tried where I needed to stop every 10min) and my heart rate was much lower. I just tried the same
route again today on my road bike, it was challenging because despite being lighter it doesn't have as many gears (compact), but it was a super ride!
Soon you'll be bored with these hills and looking for steeper ones to challenge yourself with! It's amazing how quickly the body adapts and how much more fun it becomes
Keep at it and good luck!