Tediously looking all over the castle all the time IS a pain, but the shift key lets you sprint. Makes it a LOT easier, honestly.
Also, since GP streams the solutions all the time when he tests the game, I don't think he'll have too much of a problem with a walkthrough being posted.
I'm too lazy to put one up, though.
Basically, look at shit, and pay attention to when new exclamation points pop up, it'll be simple enough.
The only kinda obtuse ones I can think of are that the fuses are hiding invisibly somehow in the same place as the books that have LoK forum topic titles for names, that the pig room is primed by re-entering it repeatedly, and that the plant scene is primed by ... I don't rightly know, but it probably involves entering the room with the Azraphel and Azrael statues relating to the plants, and maybe looking at both of them.
Also the keys are in the fire, but some blind ghostbitch can't see them until she notices the cupboard is locked.
Should be good to go.