Make sure you identify what plants you are cutting down. My son in law had a rental house with plants up the side of it. I told him it was poison Ivy.He didn't believe me and ended up in the emergency room. He ended up miserable for a couple of weeks because it really was poison ivy. He worked in shorts, flip/flops and no shirt, ended up completely covered with blisters.
Even if there is poison ivy, poison oak, or sumac, the oil in it, urushiol, that can cause an itchy blistering rash (and is still present even in winter or when dead) must get on you and stay there for a good while to cause issues. If you get in there, take care of it in an hour or so, preferably less, and then go jump in the shower and clean yourself up really good you'll be fine. The oil washes off easy with soap & water. Don't let it get in your eyes though, and also be careful with clothing also because they too will have the oil on them. Just ask my wife. Let that oil stay on you for a few hours though and you're asking for trouble unless you're one of the lucky ones, I guess, like me, who it doesn't affect.
I never felt so lucky though as for more than 20 years I had to climb, trim, and clean up by myself almost all the poison ivy trees our company came across while my coworkers just watched from a distance. Poison ivy can grow ~8' straight out in all directions from the trunk all the way up to the top of a 75' pine so thick you barely get to actually touch the tree itself.
Edit: Even when it's dead or winter and there's not 'three leaves' to see it's still pretty easy to spot poison ivy once you know what it looks like. It's a really hairy-looking vine and often has clusters of little white berries.