I disagree with the 'completely' statement. I definitely got stuck on ambiguous notions, I have definitely not known where to go, and have definitely 'played it wrong' on many occasions because I wasn't aware of smiths, how to upgrade weapons, what to do when you kill an NPC, what to do when NPC's appear and how to do their quests, etc, or how to kill certain bosses.
You can definitely complete the game blind, but even more than that, you will ask for tips and help.
But that's all a part of the charm I suppose.