Greetings.
You can get the CEP and links to instructions here:
http://neverwintervault.org/cep
Current version is 2.60.
As for advice:
I use the CEP in my PW (along with Project Q and a ton of my own custom content and content independently collected from the Vault).
CEP has a ton of content to work with...some is a bit outdated, some is new (since it covers content from the beginning of NWN up to last August). There's really more content included than any one PW would really use.
Project Q is a smaller collection, but it updates a lot of old original NWN content while providing a bunch of new, high quality content.
CEP and Project Q are not compatible out of the box, requiring custom 2da and hak editing to get them to work together.