You have to be level 60 or above to obtain quest, the area is divided between a few area battles that are sequential instead of instance, so you have to farm entire dungeon to have a chance a certain items dropped only by end boss. There are experienced teams that I've seen do it in 30 minutes. I suggest looking at fan site guides and looking for like minded/goaled individuals to so it with.
You get the quest to go in when you are level 60, so you might as well try it then. Make sure you have three other people with you ~ it gets hard! If you find it too hard, maybe come back a few levels later. To obtain the full set of gear (hat, robe, shoes), expect to do the dungeon at least 2 or 3 times, probably more. It is kind of hard and time-consuming, but it's worth it Sierra