Yeah, late NM and Hell were a little rough. I am trying to get back into HC mode. When I play SC, I still try not to die, but you can't help but think that even if you do, it's not the end.
HC being the one shot deal that it is requires a little more attention to detail. I think my downfall in both cases was item finding. In both cases, I was wearing MF gear in spots that should have held resist/dam reduction gear. I will not be making that mistake again. I can't believe I made it twice already. I will be remaking my bone necro, and I have a sorc fooling around in act 3 right now. I will also spend some time MFing NM meph to get some better gear before I head into hell difficulty. The gear I had on my bonemancer was pathetic. The wand and shield were endgame. Nothing wrong with my killing power at all, but my resists were around -30. Yikes.
Good luck everyone and Stay Safe!