There are a number of ways to edit the NPCs in a zone. I often use GeorgeS NPC Editor. It allows you to edit them by zone and very quickly with his field commands. He has a section here on the forums:
http://www.eqemulator.org/forums/forumdisplay.php?f=674
Once you get it up and running he has a Youtube Video Help you can click on from inside the Editor. Its about 30 minutes long but well worth watching.
I hope that helps.