I managed to go through Duke's Archives dying only once (the first fight against Seath, where you're required to die), as well as obtaining Avelyn on the first try, TWO channeler's tridents without any farming, and the symbol of avarice after only two Lloyd's Talismans. For good measure, I also grabbed almost everything in the archives and the crystal cave. As soon as I unhollowed myself, two sunbros were available for summon and we cleaned out the caves with no trouble. The only things that were screwed up was that i had forgotten to talk to siegmeyer after helping him in Anor Londo and thus the golem with his daughter weren't there, as well as the fact that I couldn't manage to cut off Seath's tail for some reason.
It's nice when everything goes according to plan in Dark Souls.