You can easily get used to Dark Souls, I played and beat Demon's and Dark Souls it's not that hard, hell Demon's was twice as hard as Dark especially because there is no level cap on who can come into your world and wreck you, I can't say how many times I was close to either getting towards the boss demon or getting to one of the extra bossish characters and would get smacked by a level 200+ as a level 50 lol. Also npcs were way less forgiving, smacking you down easily to half health if not to a 1/4 health. In Dark Souls I was surprised when the second tier soldier like enemies didn't kill me in two hits as a sorcerer.