I don't remember if it comes with a readme, as I only use one texture from it, not the lot. Assuming you don't make your mods fomods, just extract the archive and pull out the Meshes, Textures, Sound folders plus the esp and drop it in your Data folder - C:\Program Files\Steam\SteamApps\common\fallout new vegas\Data (that's where mine is).
If you use FOMM to arrange your load order activate the esp and the mod page description suggests putting it as close to the bottom as possible.
Edit: How is it not working? If you don't already have it you'll need http://www.newvegasnexus.com/downloads/file.php?id=35935 for the altered textures to show up properly, like the sky.
The way I tell it's working is by the night sky. If it's pretty it's working, if it's a bit bland and boring it's not

If my version of explaining doesn't help much someone else may be able to be a bit more detailed. I don't know what time it is for the majority of the board, they might be sleeping. It's midday here.