What I personally did when taking an alt through the MSQ, to avoid the queue time, was to level to 80 and purchase item level 510 gear and solo'd it as a tank using the Unrestricted setting. I don't recommend that because it was very challenging, it probably took me about 40 minutes, and I had to learn a secret mechanic that allows you to get the boss to heal you.

However, if you got all the way to 90 and purchased 620 gear from the market board, it may be a lot easier than when I did it due to the higher level and gear cap now. You could also try it with 1 other person if you can find a friend.