We usually cleared it with 3 people when we did it a while ago. But of course we know what we are doing and using essences.

The queue will pop after 10 minutes regardless of how many people queued up and you will get the echo buff.

But yeah, a group of 3 newbies will have a hard time.

They probably should remove the doom debuff for failing 2 mechanics in a row to make it more accessible.

And also from the tankbuster of the final boss, which you have to dispell. A shield also works, when you take no damage the doom debuff will not get applied, but I can see that it is a lot harder for some jobs to solo the whole thing than it is for others because of this debuff.