While the official difficulty says that it is an expert level quest, I really do not agree with that assessment. You can do this at the lower levels. If you are 20 hit points or around that number, the quest would be more than doable if you keep your attention and know how to spot monsters. For example, you do not need to fight the hellhounds that are defending the perfect gold ores. The 170 demon is an easy one to safe spot too. You can fight him without taking any damage at all. All other things in the quest are pretty straightforward. You do not need to do anything complex.