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Get a newspaper, roll/scrunch up a bit, light it on fire and hold it beneath the nest. Then when they try to fly out their wings immediately singe and they drop to the ground. Then you can step on them with boots. I don’t know yellow jackets but that’s what I use in Australia for paper wasps (which are very aggressive).
If it’s just passing the fire over the nest it shouldn’t catch the wood on fire, but it could damage the paint. You don’t need the heat under the nest for long though, just long enough to burn the wings of the adult wasps