So after falling from the tree all the way to the bottom I cried a little, then went to Chalice of Tears for some easier, more relaxed jumping. I put on training wheels with my Mesmer until I felt ready for the big task. Logging back on my favorite main, I beat the sucker without any major fallbacks.
So, without further ado, here's proof of reaching the top with my lil Engie, Qt Le Fluff, burning fireworks in the safest place ever.