Al,
Agreed, hand pruners work best as you can control where the cat o' nine tails will end up. In a pinch (pun intended), you can strategically snap the woody part of greenbrier's stem between your thumb and index finger and hook the whip like velcro on neighboring tangle. Also, once you get down into the leaf-litter the thorns become softer but more numerous so it is possible to yank the base out of the plant bare-handed, which works good during the odd equivalent of spelunking. Thorns are most lethal to kneecaps so consider work pants with built-in knee pads. Small brier patches can give way to boots if you walk up the thickest mat of stems like a tightrope, but pick your battle carefully lest you end up Br'er Rabbit. Some of the most wickedly cool spungs are sheathed by brier ramparts, so Pine Barrens pinstripe flesh is often worth the effort. No matter, there will be blood.
S-M