iksar necromancers + old world necro guild faction

[pharmakos]

just rerolled my erudite necromancer as an iksar. probably going to move off of kunark once i out-level kurn's tower. i'm just concerned about how i will acquire my spells in the old world. how easy is it to raise faction with the various necro guilds in the old world?

i've looked over the wiki a bit, and i see it is possible to raise Bloodsabers and Dismal Rage factions by killing some good guy priest types. how long does it take, though? and what are my other options?

i know i could just make a mule / have a friend make a mule and buy the spells that way. i would rather do it this way, though.