It requires disassembly of the guitar (An opportunity to set your action lower if need be) and the Buzz Kill is used to line the pocket beneath the pickups and any other areas including spaces around the output jack.
The stuff is a 4" wide roll of thin copper sheeting with an adhesive backing. Worked like a charm for me. YMMV.
Yeah.... I thought that was the direction I might be headed. Like I say... it is not real bad hiss, but not dead quiet either. The wiring all looks in tact, and maybe the guitar was always like that. I don’t know for certain. But I do know using the wireless rig eliminates the hiss/hum all together.