Turns out my fears were unwarranted. Of course, the tank's gear also helped. As did the dps capabilities of the entire group. First time I saw a survival hunter outdps a mage.
Just the 3 wipes. First one was the 2 bog lord pull before the first boss. I had Righteous Fury up (90% increased threat on holy spells) for some retarded reasons, so my heals pulled aggro, and I got critted into oblivion. The rest of the group followed, but not before taking one of them down, so then it became a standard bog lord pull. Then, the second boss got a thrash (extra hits, like a windfury effect) on the tank at the wrong time. The final wipe was due to the tank pulling 6-7 insects at once just before the third boss. We stayed up for a long time nonetheless, before they overwhelmed us.
This was the first time I healed for the 2 bog lords before the final boss. Tanks are often required to use Shield Wall just to get past these, and not without reason. I saw our warrior get hit for 8000 after only a couple of growths. The tank actually went down on the second one, but the group managed to finish off the bog lord.
Just about an hour and a half later, we all left the instance 4 badges richer. I also got myself a Cossack of the Loyal (finally able to discard the leather legs from Kara), a dps ring (meh) as well as the Argussian Compass, which makes AoE farming a lot easier. Very successful run.
I am regularly AoE tanking non-heroic 5-mans and breezing through them as a result. The healing stints categorically proved (if only to myself) that my hybrid spec is definitely where I want it to be. Not being shafted into a healbot role makes playing a paladin that much more enjoyable.