Congrats, I love that set. I worked SO hard to get it when it first came out.

So it procs on critical damage. As such, you want to make sure your build is delivering 60%+ crit rating. This will keep it up close to its max. Look for skills with major savagery...camo/evil hunter on the bar if nothing else.

It's a pretty easy set to know procs. You will get an audio cue, which is supposed to sound like vines or crunchy leaves or something. And you'll get an animation of briarhearts vines around your wrists...they're gold and glowing and hard to miss.

Any crit damage can proc it, so DOTs and AOEs become your friend. Not sure what class yo are, but if nothing else Caltrops will force it to be in continual proc. Once it goes off, you can also see it on your character sheet for the ten second duration...or if you turn on your buff bar in settings.

I've used this on my stamblade, stam sorc and my stamplar. It's a great set. People are more into clever alchemist now, but I prefer this to the potion popping.