Right now the best thing to do is to not level. Trying to fight may result allot of gear wear. If you do fight try to stick to Levees that you know you can beat. Slow and Steady. If you can find a group to party with then great, you get extra protection so when you gimped job cant cut you will never know. Just don't use Marauder, they pretty well nerfed for the time being.

When I leveled CON, I did so through levee quests and using spells from my Thurmage to survive. I actually did pretty well when I had the time before. But now its just slow and steady. If you start getting KO'd it will hurt your wallet allot. Your gear will rot quickly.