Take a look at the posts above in this thread to get some idea of what others have been doing and how it affects their success. You may also find the following topic useful for ENARSI as well:
Other than that, resources for both ENCOR and ENARSI are quite complete on this site, and others have found this to be the case. However, if you need additional resources, try gns3vault.com for lab topologies.
Now if you meant CCIE Enterprise, then the following post may be of help as well: