I assume you know about it, but the Daughter of Chaos bonfire is a lot closer to the Pyro trainer. You only need to handle 3 rock throwing guys and a handful of mosquitos. The bonfire is behind an illusory wall... but getting past it and just joining the covenant gives a nice Pyro spell along with warp access to both late-game Pyro trainers.
Yeah for some reason I forgot that like a dolt and I actually went through the New Londo/Valley of Drakes shortcut to get to the Blighttown Swamp trainer. :X Boy do I feel like an idiot in retrospect.
As for Nito, yeah, that spell being active was my entire problem. I went in there without the Cast Light spell active and when he came close I launched 4 Crystal Spears, 1 Crystal Homing Mass, and 1 Soul Spear to end the fight. Didn't even use but a few Estus getting to him.
Maybe it's just my playstyle/build but once he closed distance he really wasn't hard at all. I recommend you try him; he's a pain to get to but I'm sure you can do it.
As for me, on to the end of the game. Here's hoping I did things 'right' to save the life of a certain NPC... although I took the shortcut into Lost Izalith so I might've skipped a necessary encounter, I dunno yet...
And finally, on-topic. When I was making my way back down to Nito I tried to run past that one area where there's a few of the quadrupedal skeleton and I quickly found out why it's a good idea to stop and kill them all, even if it wastes spell charges. :X
Dark Souls, like that isn't all I've been playing lately.