(I wrote an unmemorable 1% of this game. The stars are for the other 83 people.)
I'd like to push back just a little bit on some of the introductory text from Cragne Manor. Not the parts about how the game is insane and brilliant and fun; that's all true. I'm immensely proud and grateful to have been part of it. No, it's the stuff about being prepared to be frustrated or overwhelmed on account of its hugeness. I completed it a few days ago, and I was surprised at just how playable it was.
There are a couple of things that distinguish Cragne Manor from something like The Mulldoon Legacy (which is amazing, but is definitely overwhelming). First, Cragne provides a fantastic amenity in the form of an item that tells you if you're able to solve the puzzles in a given room, or if you need additional information or items from elsewhere, or if you've done everything you need to do already. It's difficult to overstate how comforting this thing is. I get overwhelmed in huge games from the combinatorial explosion of rooms, puzzles, and information. I can't keep everything in RAM, so to speak, and become exhausted even looking at my inventory. The (Spoiler - click to show)coffee cup in Cragne kept my headspace manageable.
It also helped tremendously that each room was written without knowledge of the other rooms. Without saying too much about how the game and its puzzles are structured, this means that almost every item or piece of information is single-use. There are definitely things you'll need to take notes on, but for the most part, you use an item or a piece of info, and you can then throw it away (or put it in the zipped-up trash pocket of the brilliantly-implemented carryall). And many of the biggest and best set-piece puzzles are standalone.
I worked alone in my playthrough, and only needed a few hints. It probably took me over 30 hours to finish, and 6800 turns (maybe twice that when you consider moves lost to restores). But I always knew what I could do next, what would have to wait until later, and what items were still useful, and that made it manageable. Don't let the size of Cragne Manor scare you off.