Sorry if this is a dumb question. This is the only one not to come from the nexus site, and I can't seem to figure out how to add it over.

Just install it the normal way. You only have to drop the esp file in the data folder and activate it with NMM or any other mod manager, that's all.

Just unzip the .esp file to \Fallout New Vegas\data folder, and it'll appear in NMM's plugins list.

The full path is something like c:\steam\steamapps\common\fallout new vegas\data\ depending on where you have Steam installed.

I have just made a desktop shortcut to the \common folder to get there and to toher Beth's games folders quickly