I currently have two receivers, a ViP622 and a 508D. I want to switch out the 508 and get a ViP211. On the website it says $25 dollars shipped or $75 installed. Here are my questions. If I already have an HD receiver set up and am receiving an HD package, is upgrading the receiver just a matter of switching the receivers? Is there more to it than that which would make me have to pay the extra $50 bucks for installation?