Yeah underground pass was a shocker for me.. mainly because of the agility part I kept on failing and had to make it all the way back to the top like 20 times -_-
i have 258 QP and to be honest none of the quests were "hard" there were some long ones, but thats about it. only one that gave me the shits was underground pass because i was using a crappy fucking guide, that fucked me over in like 5 parts of the quest. took me 3hours!!
I've been playing for years, and I barely have any quest points, lol. I only did the quests that I needed to in order to get armour or something, for example.
I thought they'd be really hard, but all the quests I've done so far turned out to be extremely easy.