hey man, as far as ive personally figured the 3 candles in the house go out over time if you stay to long but just going outside for a little will reset them, even if a skinwalker is outside you can dip in and out to at least slow down the candle progression (if the shadow does spawn i dont think you can get rid of it i think its just now a new thing to keep track of in your run,
the skinwalker when coming will start making that kinda loud not music just noise shit then after what i can tell is about 3-5 seconds the skin walker will be close enough you can hear his violin noises usually just out of view of the camera is when you can hear the violin, and once you make it to your house you know its safe again when you hear a loud violin draw indicating he's gone
pro tip as said before you can dip in and out of the house if a skinwalkers there to slow candle progression but you can also use this to when you dip out right after out of eyesight you will hear the violin as he agros on to you, but do this 2 - 4 times and suddenly you wont hear the violin when you step outside, this is because when the skilwalker leaves i believe it has to hit either side of the farms fences, but you only hear the violin draw string sound when his model is actually gone, you can use this dippin trip tech as i call it (sounded better in my head just gonna roll with it) to bassically get an extra few seconds freely to walk the farm right before the skinwalker actually disappears
sorry for the text dumb i Love this game and have starrted speedrunning it
hope this helps man, Happy farming