That's a pretty tough instance. I did it in an on-level group with my hunter, but only completed it thanks to a very kind level 75 warden tank (then the cap) who came to help our group out.
Thinking of the mechanics of the last boss, you may find it possible to duo it with a higher-level warden, champ, or guard well before you'll be able to solo it. The last boss is much easier to take down if you are shooting arrows at him from behind.
Galadhloth, Hunter 100, Glirithil, Mini 100, Calanor, LM 100, plus lots and lots of alts
Watchers of Elendil ~ Landroval ~ Crickhollow ~ Tarciryan Knights
~~~~ Imladris in the Forgotten West ~~~~