First you need to locate it with a map that you can obtain trading with villagers. When you find a structure it need to look like this:


This is a simple woodland mansion. You need to prepare for 1.Vindicators 2.Evokers 3.Vexes 4.Zombies 5.Spiders 6.Skeletons, use the items you consider best for this, but remember: 1 opportunity 1 time 1 day. The part you need to take a screeenshot is a wool statue in the first and econd floor, they look like this:


This are the models. In a floor you can find prison for allays with allays inside and prisons for villagers without villagers. In one of the 2 highest floors you can find Evokers, rarely on first floor. They summon vexes when they see you, another cause of having armor and swords. If you kill a evoker near a zombie they pick up the totem and they fastly lose them when you kill them.