How do I properly complete the quest "In Wolf's Clothing" before doing the "Nameless" main quest?

Solution 1:

I will avoid being too detailed and will just give some general steps, to not spoil too much. You can make your own inferences and discover the plot on your own.

1. Pick the quest up from the notice board in Larvik
2. Talk to Josta in Lofoten
3. Talk to Einar at Larvik's dock
4. Go to the front gate of the Freya's Garden, which is locked
5. Climb the stairs to the left and follow the elevated pathway to a tree. When you interact with a grated gap in the ground, Geralt will comment on how it's too dark to see what's down there. That cave whose entrance icon on the map is in the middle of the garden is part of Nameless main quest
6. Continue down a tilted pillar to the ground floor with the wolves
7. Go in a U shape to the other end of the garden
8. From a mess of footsteps, two paths diverge. The normal one with the blood leads to two locked doors perpendicular to each other, which are also associated with the Nameless quest, although the left one leads to an area you will enter later. The other is Morkvarg's
9. Follow Morkvarg's footsteps to reach two levers that control the garden's sluices. After the cutscene, continue following the footsteps to a cave (it also has a cave icon on the map)
10. Go back to the levers and use them to open the rightmost sluice
11. Dive into the underwater passage behind the small waterfall, to get a Padlock Key
12. Go back to the tree and unlock the doors of the rooms in the nearby building. Read Morkvarg's journal
13. Talk to Einar again
14. Go back to the levers and use them to open the middle sluice, OR jump to the iron gate near the levers and unlock it with your key, OR enter the area through the aforementioned left door
15. Once in the area, turn right to enter the building with the chain linked to the floor. If you got in through the left door associated with the Nameless quest, you can ignore the well that's part of that quest
16. Interact with the chain and you will now be able to deal with Morkvarg in two new ways

By two new ways, I mean either feeding him his own flesh from the chain or giving him the Cursed Fang Pendant.

Also, if you do lift his curse, you can ask him about his reward before killing him (if you intend to kill him), in order to get his reward on top of Josta's reward.