Else, without that knight/ seer I would say just as hard as DS.
But yes, with those it becomes much easier.
The team I use for this quest is water knight & a wit which is faster than the soldiers (Don't have a seer).
Done with & without. Long ago we didn't have fast knight and still managed to do it a couple of times, but it was stupidly hard, yet at the time, we could easily manage DS/JS.

So in the end, for the inexperienced with this quest, or those who do not have a suitable team it is hard.