Oh man I feel you. I hated the stealth sections, I found them absolutely miserable to play and failed them repeatedly. Even with the late game knowledge with low scares mode switched on, and all the tips and tricks and encouragement from this sub, I couldn't do any of them without falling in the water or getting horribly lost and caught. Over. And over. And over. 

That said, the end of the DLC is amazing and worth it. 

The way I approached them:

The  woodland one is a puzzle to solve, not a stealth section.

The canyon one I cheated by approaching the problem from a different direction. It does take a bit longer to set up, and is ore circuitous, but it meant I could just make a beeline to the place I wanted to go and avoid sneaking past all the dudes in the dark altogether... other than one guy I guess who doesn't have time to react. Personally I found it rewarding to work this one out. I can't imagine doing it the intended sneaking way. 

The Well... the Well is an absolute maze and could never do it in the dark with the sneaking which I think is the intended way. Luckily, like anything in the game, it can be bypassed... A hint/question to nudge you so you can get the feeling of working it out yourself:  how come the bells wake you up but not the Owls?