My first WT was with a psn necro...reached A5 NM without any farming. I even didnt use CE cause I found it too easy and no summons except golem.
So I guess with CE it's gonna be easy to reach hell! Bosses are lonnnng to kill tho with only psn damage....my merc sucked in this WT so I had to run, cast poison nova...run...cast poison nova....its safe, but long!
If u have any question just ask me in PM, I'm not a pro but maybe I can help you.
Nataure
Edit: This means without a good merc, your farming willn't be bosses!