Doug, I do the tree vines during winter when the leaves are off. Less chance of picking up rash. I use a machete, hand axe, even a chainsaw on the big fat ones. Just cut them low and you'll be good. This helps because the birds have to go elsewhere to get the berries which grow high in the trees; the vines aren't being constantly reseeded. In the spring you'll be amazed how it opens up the canopy to have all that crap cleared out. Obviously no help this year but next year...
1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
All my troubles are Rover