I didnt try it yet
is it possible without CTA? Any tips? would like to do it without losing my hephaisto

Izual demolished me with chilling armor, even with max cold res and race frost

Easy way to deal with chilling armor:
use mirrored blades (you already max it anyway)
you consume a goatman for +6% CB (or more if you invest in its synergy), on top of any other source of CB, which is not normally applied by echoing strikes
it's that simple... but it seems most people just want to keep using echoing strike at all time and cry after they died.

Another way to deal with izual is to just have high enough demon mastery to get 3 total demons, then you have 2 goats. they'll cb him down it just takes a bit. recast as needed. having a pet with CB is a pretty nuts thing for blizz to dream up.

Ok so what worked for me, maybe this helps others:

put hephaisto between you and izual/baal

this worked very easy he took all the cold bolts xD