Yeah, um I definitely tanked the adds on my warrior in arms gear using a sword and shield with an average ilevel of 352. We didn't down nef that night (was a pug \ alt run), but we our issue wasn't in the first phase. The OT just has some issues in last phase kiting adds (wiped at 6% once). If you have a decent healer and you know how to pick up all the adds and get a bit of range on them for a few seconds, its not a big deal to tank them. Just want to time your cooldowns so you have your biggest cooldown going right before they start dying (aka, when they are doing the most damage). I would always shield wall when the last one I picked up was at 50% energy, because that put the first one around 20%.
Edit:
Another option is to get your mage to go frost and kite the adds or help the DK kite the adds (can probably do it decently as arcane tbh, but frost has a lot more options). Our first nef kill we used a combo of frost mage + fury warrior to take care of them, and if you notice he took very little damage since the adds only hit him a few times each.
http://www.youtube.com/watch?v=j1-Yt...layer_embedded
(this is an unedited video with vent, so the sound is probably NWS)
Also, I see you are asking for help for transition to phase 2 now. Just make sure you get the raid topped up after you get your crackles from nef, and don't let anyone take ony lightning (your tank should be taking care of that). If all are topped when ony dies, you should be fine until you make it onto the pillar. Your healers should be using any instant cast heals they can as they go up, and then start spamming heals as soon as they get on the pillar.
Everyone else should work on getting to their pillar and practice jumping out of the lava asap to get the adds. This was a requirement back when we originally did nef, but with the way they changed him it can actually make it harder for healers. His adds used to start casting a blast nova right before the lava reached the top of the pillar, so if you didn't time your jump right, and immediately interrupt it, the raid was wiped out. It delays casting it for like 4 or 5 seconds now.
But anyway, the pillars are easy once people learn how to get out of the lava quickly, and if they are topped.
If you have a lock then lock stones are great for this phase, and even health potions. This fight is not a dps race in normal. Your dps don't HAVE to save their dps potion for your lust phase. If a health potion in P2 is more beneficial they should do that instead. If you don't have a lock and are still having trouble with this phase, try to see if anyone has an alt lvl 85 lock. You can actually have them log on their lock, zone in and summon a soulwell, then switch back to their main and everyone can still use the stones. They can even get one as well (the soulwell does not go away).