Can someone offer insight/advice on a mod?

I'm looking at the Neera expansion, and while everything looks right to me, I don't know much of how this works. The last mod I tried went so badly I had to uninstall the game and redo everything. I don't want to do that again, so I'd appreciate if someone could help a noob out and warn me of any issues with it before I try using it.

http://www.shsforums.net/files/file/1022-neera-expansion/

Likewise, if anyone has used it, any tips on how to get it working would be greatly appreciated!