Yeah, those two can banter at how OnS was... but my first encounter was like you, a very Hellish encounter. I don't know if this will help, but I remember my gear.
Raw Serpent's Maneater Greatsword+5 with Havel's Armor. Charcoal Pine Resin that Sword and go to town on Ornstein, and deal with Smough. Ornstein has a lot of jumpy attacks that requires you to be on his crotch. Smough is just wait for him to do his charge and attack (stay between a pillar), take that cheap shot, and return back to behind a pillar.
I hope this helps. It helped me!
(Also, just do it as a hollow 00 humanity... if you can get human and humanity, that is fine. But don't risk losing your humanity if you don't have the skill to get to final phase or be quick enough to get your souls back)