What Level do you end DS, if you do all sidequests in every world before and currently.
I am usually around level 52. That is doing all sides all the way to that point. I find it better to start Celestia at a higher level then required. I also have access to Wintertusk so I can quest there for experience also and it gives me a break from Celestia.
I have the level 56 crafted gear from Wintertusk for all my wizards so the closer I am to that level the easier Celestia goes.
I'm usually level 45-46. I skip side quests up to this point. After I kill Malistaire I go back and finish Grizzleheim to level up to 48 so I can do Celestia. Then I do Wintertusk after Celestia to level up and get gear for Zafaria.