I have an older legacy 500 dish with a DVR-510 receiver, picking up 110 and 119. What would it take for me to switch out the dish for the 1000.2? I am just getting ready for the new bird at the end of the year (129) and want to mount the new dish myself. Installers in my area (Pacific NW) are sticking the dishes right to the roof and I want to use a retrodeck for a cleaner install and ability to change out if necessary. Would I have to change switches or just swap out and re-aim? I won't subscribe for HD until the new 129 is up and functioning and I would just as soon have only one dish and not two. Thanks in advance for any help or suggestions.