Install Varnish/Turpentine on Magento

We require Varnish along with the Turpentine extension to be installed on our Magento site. Requirements: - Install & configure Varnish and the turpentine using best practices - ALL dynamic areas of site need to continue working as before - We need to get the IP address of the end user as we have an extension they relies on this (it mentions how to do this here [login to view URL]) - Fix any bugs arising from the installation We can provide SSH root access and FTP access. With your bid please provide details regarding how long it will take you as well as expected site down time.