Someone talk me through getting rid of wasp nest?

Honestly? If it's small, early in the year and somewhere easy to reach, wasp nest powder puffed into the entrance at dusk, when they're all inside, usually does it. Anything big, anything inside a wall or roof space, or anyone in the house who reacts badly to stings - pay someone. It isn't expensive and they have the suit. Whatever you do, don't block the entrance hole up, they'll chew another way out and sometimes that's into the house. And if it's late autumn and not in anyone's way, you can just leave it. They die off over winter and don't reuse the nest.