I usually put on a couple thick layers of clothes and tuck everything into eachother. (wrists and ankles can be rubber-banded.) I put on safety glasses, a mosquito netted wide-brimmed hat, and a hoodie over that. I get a small can that I use for making a small smoking fire. The mosquitos and biting flies don't give me much time to plant in the spring if I don't carry some smoke with me. I set up the smoke in a place I can escape to incase I'm being swarmed, but where it also lets it blow a bit where I'm working in hopes to slow down and confuse the wasps a little. I get a metal can large enough to fit the nest in, and add a teaspoon or so of gas or similar inside for a hopeful quick death. I bring a sharp putty knife, a fly-swatter, and a can of hornet-spray.
I find with the mosquito netting, the wasps don't recognize me much, so the first attempt to get me I flinch. Afterwards I am pretty confident in my gear and just get the job over with, and I'm often up on a ladder so calm is important.
I wait until just before dark when they seem to be quieting down, and watch the hive for a while. Usually there are a few wasps in and out of the hive. I try to wait until most are in the nest.
I take the lid off of the can and lift it up until the nest is inside and cut the nest down with the putty knife. I quickly put on the lid and set the hive aside where I won't knock it over. Then I use the swatter to get rid of the ones who weren't in the nest.
If any are left, they will likely re-build in the same place or nearby, so I try to get them all. I then spray a quick shot of bug spray where the nest was to discourage the rebuilding in-case I missed some of them. I'm not sure I would spray in the chicken coop..