You don’t need to use Sevin. You just wait until it’s dark and they go into a torpor. They won’t defend the nest at all. You can take the nest down, relocate it, do whatever you want with it.
Throw it in a metal trash can.....Add fire starter and match. Cover....3 minutes for rare, 4 for medium, 5 for well done..
A lot of times the nest is below ground. Wait until near sundown and you’ll see them entering the nest. Once you’ve located the entrance in the ground, just spray some wasp killer down the entrance. They won’t make it back out once you’ve hit the entrance with the wasp killer.
Ya learn something every day here at FR. Same thing our chickens would do at sundown.
B-I-L and friend needed to remove a bald-faced hornet nest so they could use the truck. The arrangement was to dislodge the nest at night into a heavy garbage bag. B-I-L dislodged the nest and holler “OK” so the friend would catch in the bag and dispose of. The friend was too quick on the closure and the Hornets weren’t in a “stupor”. A one time plan went awry.