SPOILER...youve been warned


So my issue, not complaint but issue, with games like this is I can never tell the difference between difficulty and my doing something I shouldn't be doing. Like Skyrim. you CAN attack the guards but the game will make it very clear you shouldn't. I am in the goblin base. I was able to talk my way in past the outer defenses. I'd also like to add these goblins are really amusing and diverse and if this is an example of the rest of the game I'm stoked. back to my question, so I'm wandering around the inner sanctum and I have lost track of how many of the little bastards are in here. There seems no end. And im suppose to assassinate a leader when there are in fact 3 here all surrounded. I don't see my doing anything without waking up the whole place like a Took in Moria. I tried to assassinate the witch, that aggro the planet. So my question is this. Am I dong something i'm under-leveled to do.....OR am I going against the grain of the game trying to do something I cant do?

I would appreciate any answer that doesn't blatantly tell me what to do. A simple , "the game is punishing you for trying to fight your way in" or "Nope you need to level and come back" will do

Also is there a way to sabotage the drums without pissing off the world?