Driving in the snow with my Yaris 2014 LE

[Eforno]

So a week ago I was driving at night while it was snowing. There was already a good inch of snow on the ground, and I had to drive up this steep hill. I lost traction, I was stuck in halfway up the hill, and my Yaris was just sliding to the curb. I'm running on the stock all-season tires, Goodyear Assurance, I believe. Can anyone give me tips on driving up hills in snow and driving in Winter weather in general? I live in central New York, so snow here can get pretty bad, but as a college student that's living 320 miles away from home, I can't afford to buy winter tires, nor do I have any place to put my other tires at. I'm considering to buy chains, but they're really expensive too.

Thanks.