In this video from the Open Mic Webcast ("LEI Installation Basics for Windows and Linux"), Pauline Pagsuyuin from the L2 Support team describes the per-requisites to keep in mind when beginning an LEI installation.

More information about the session, including the presentation and full video can be found at the Webcast document for the event:  http://www.ibm.com/support/docview.wss?uid=swg27047099