Part 1 - You will find him at Rockrest Flat then walk North and break the wooden fence, he will be sitting there. Part 2 - You will need a Sobering Stone that you can get by exploring Windrest Hamlet or completing Main-In Stone Questline which will sell it for 6,480 Will (Farming for it: Windrest Hamlet is at the Crouching Tiger Temple, go past the area where you fight Tiger Vanguard, go until you see Windrest Bridge) reach the large central square and on the left side is glowing jar with Sobering Stone Inside. Part 3 - Go back to the Boar and Sober him up then follow the video. i Stopped at this point of the video to avoid spoilers. Let me know if you would like a guide for Man-In-Stone Guide.