It's the Dark Souls of soulslikes.

Jokes aside, this game is not as nightmarishly difficult as you might have heard. It requires you to be patient and willing to learn at times, and it can be easy to get lost or walk the wrong way (Especially early in the game. Don't go through the graveyard until you're ready. Trust me.)

It is still difficult, but this is not a game that requires lightning-fast reflexes and perfect timing.
Dark Souls commands respect but will also respect the player in turn. The player might die in two or three hits, but so will most of the common enemies. There are plenty of traps, but if you inspect the environment you can usually spot them ahead of time. There are no automatic checkpoints and you drop your currency when you die, but any item you pick up or lever you switch stays and you don't have to go do it again, so it never resets any non-combat progress.

Bosses that happens to die at the same time as you even stay dead after you respawn.

If you're willing to give this game time and not rush through things, you'll likely be able to persevere to the end.
If you haven't experienced the Souls series before, it might very well change how you view games.