Night + wasp spray is the cheap answer.
My parents had a soft fruit business, and used to have to deal with a couple nests a year, so I’ve seen them dealt with numerous times.
Wait until it’s dark so they’re all in the nest. Then depending on location, spray into the entrance and quickly block the entrance, or poke a hole in it with just a big enough screwdriver to get the spray in.
Powder is more effective, as the wasps will drag it into the nest, whereas spray tends not to fully kill the swarm.
Be warned, wasps will try and exit the nest when you disturb it, so spray in, and block as quick as possible while wearing thick gloves.
The alternative if the nest is removable i.e. on a branch, is to wait until dark, carefully cut the branch, then holding the nest in front of you, walk backwards (wasps will come out, but they’ll typically only hover as they’ll be disorientated and you don’t want to be walking into them). Then you can bag/burn the nest. Or throw it into some hens/chickens, ensuring the nest bursts on landing. Hens will quite happily tear it apart to get the larvae.
If you have to deal with them during the day, then you really want your entire body covered, along with a smoke gun. The last thing you really want is an irate swarm, and lots of exposed skin!