Ok, this may be a really dumb question, but I have to get my arms wrapped around this so I understand.  Like many others before me and many others after me, have built a nested lab following one of the many guides on the net.  I picked, Building the Ultimate vSphere Lab – Part 1: The Story | Boerlowie's Blog.   I have the lab built and have read the blue print and started to read the documents in the blue print.  I also picked up two books, Official Cert Guide by Ferguson and Atkinson VCP 5 Study Guide.  Both are very good books.  I have started to flip through them and have noticed the activities to try things to further enhance your hands-on learning experience.  Yes, this is what I wanted.  As I flip throw the pages and look at the different activities, I am thinking, in the nested lab I built, how do I practice installing EXSI, vCenter as I have built those when I built my nested network.  How does this work with my nested lab.  How do I install EXSI and vCenter since it is already installed in the nested lab?  Do I remove it and then re-install for practice? 

Lab current layout:

Workstation 9 using WS 8 Hardware

     Template for Windows 2008 R2

     DC VM - with DNS, DHCP, AD

     vCenter VM

     ESXI VM

     ESXI2 VM

     Networking - with vMotion and Fault Tolerance

     Desktop VM - I added this for few different reasons

So if the activities in the books I bought want me to install ESXI or vCenter, how do I do this within the nested lab?  When I get to vMotion and Fault Tolerance, what then?  Sorry for such simplistic questions to you experts but I am trying to understand this so I can move beyond the basic questions and really sink my teeth into the blueprint and practice lab.  Any answers, advice, guidance, etc. is greatly appreciated.