I broke most of my trial weapons(H2H, club, staff, polearm, sword, dagger) and Mythic weapons(sch, mnk, pup, rdm, drg, dnc) solo,with my NPC in Kuftal Tunnel or The Boyahda Tree. I examined SC charts to find out what weapon had the greatest chance to open a level 2 for the weapon I wanted to break, gave it to my NPC, and went at it. Make sure your NPC is tuned to Fierce Attacker, and set them to tell you before they WS. I haven't done any since the 75 cap was broken, but it seems like it would only be easier now, /sam with Sekanokki and /dnc with Reverse Flourish.