Keep at it, it will get easier. I have a similar situation, there is about 200 ft of elevation drop from my house to leave the neighborhood. When I started riding the beginning of this year, I could not make it back to my house without walking the bike or taking a break. Now I do intervals going up and down the same hill. Getting a smaller front chainring is a good suggestion, do not be afraid to get a good "granny" gear on there and use it.