Hahahahahaaa!
The first time I did it, it was a pecan TD, using a HiRanger. I was setting it up, when I noticed black hornets flying in and out of a hollow spot on a low limb. Just the action of me driving up set them off... they were dive bombing me, the crew, and even stung the homeowner's dog. Ha!
I scratched my head, thought... WTF am I gonna do? So, I went to a rental company and rented Bee Gear. Read that as a hat and face screen.
I thought to myself... I need more protection. I stopped by my crib and grabbed some extra clothes (shirts, coveralls, duct tape) and headed back to the job site. I also stopped and bought 6 cans of hornet/wasp spray.
Upon arrival, I donned all my extra clothing, wore the hot gloves we (we also trimmed HiLines) had, closed all my shit off with duct tape, and headed up to do battle with these black bastardos. I could barely move... and it was 90 degrees plus.
The amazing part was how loud they were, attacking me. I couldn't hear anything but the buzzing of these fuckers all around me. The groundies could have fired a shotgun and I wouldn't have heard it. I just persevered, emptying all of the cans into the hollow. They told me I was surrounded by a black swarm and they couldn't believe it.
When I emptied all of the cans, I lowered the bucket down and stepped out. I could feel the crunching of all the dead hornets that fell on the (plywood covered, as all of them should be) headache rack.
They were still buzzing me, but not near as much. I disembarked, walked FAR away, and they stopped following me.
The homeowner made some coffee, we took a break for about 45 minutes, then I went back and slayed the pecan.
It was a hell of a job!