Surviving, I felt like I was a Sally for just running as fast as I could and trying to avoid as much as I can.
I also have a stealth thief/assassin and, even at lv 28, fighting something hand-to-hand is tough and usually ends with me face down the snow.
As others have said, keep health and stamina on a 1:1 ratio, carry health pots and use poisons. Lingering health damage and paralysis are godly for giving you an edge in a fight. Also remember you are made of paper and sometimes running away to hide and then striking again when you're ready can be the solution. I had a 20 min duel with a sabrecat this way and eventually killed it. Was fun to sprint away, hide behind rocks, heal up health and stamina, re-apply poison and then spring out again