I am asked by local people because I keep bees. I have the clothes, that is the bottom line. Wasps are usually no problem. Later on when food is scarce they are far more vulnerable which means that they get closer looking for food to scavenge. As long as people do not flap about they usually go away. In truth they are more useful than any harm since they eat lots of the little mites on plants that can be a plague if not checked. If it was a huge structure in the UK then it was probably hornets, even less harmful and certainly more useful (except for eating some of my bees). Wasps' nests are perhaps a bit bigger than a rugby ball, which is 'huge'. Even an Asian hornet nest over a metre long is no weight at all, I have moved a couple out of 'season' when they are empty. Two men dressed up like spacemen impresses the cheques out of books, IMHO.
If you must do them in, the Kapo is as good as any other. You need to be a bit protected. Stand well away with your protected arm in a plastic glove (to stop getting the foul muck on yourself) then squirt into the entrance. leave an hour or so then go back and give a second squirt. Next day, take a rake or even the rake handle to smash into it and if there are survivors a final coup de grâce squirt. Remove after that has dried.
I personally prefer not to kill them, just remove the nest late autumn when it is 'dead'.