Arnim van Lieshout over at van-lieshout.com has created a great blog post with all the steps involved in completing the setup of the PowerCLI/The VESI environment:
1.Installation of Windows PowerShell
2.Installation of VMware PowerCLI
3.Installation of The Virtualization EcoShell
On April 8th we had a very good DutchVMUG meeting, which was totally dedicated to using PowerCLI and The VESI (Virtualization EcoShell Initiative). Although setting up the environment is straightforward, I wanted to do a small write-up which leads you through the install process and includes all download links needed.
http://www.van-lieshout.com/2010/04/the-vesi-getting-it-up-and-running/