Inside the Harpy cave you will find a lot of Harpies and the thing is to not get surrounded cause that will mean certain death. Quen is what I used again and it seemed to work alright. Some quests get completed and others get started. It took quite a while to go through the cave. The Harpy traps have to be placed on the ground where a Harpy will pick it up and bring it to one of the nests. I bought 10 Harpy traps from the black smiths, you only need 7 but I used all 10 to get it done. Once the last nest was destroyed I just ran out of the Quarry.
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