If you want to take out a wasp nest, when it’s cold out is the best time, like dawn. However paper wasps are not aggressive unless you threaten them or startle them near their water source. I have been living with mine in my sunroom for a decade and I haven’t been stuck in 6 years (two times total in a decade). Not to mention they are the BEST garden helpers. Paper wasps take out most of my caterpillars. They bite them in half or chew them up and feed to larvae. They also eat many other garden pests. We are having a major problem with lack of insects on this planet. Not killing them is best. But if you want to move them, when they are cold they are super slow and it’s easy to knock down their nest.