I am a green horn on the sat details...I just know I want to go HDTV, thus I ordered a 921 for the $549. I want to be ready to hook her up but don't know a thing about that. I know this has been asked a zillion times or more but if you could humor me, I would like info on a hook up from...I know I have twin LNB's on the roof(thats two seperate heads pointing to one dish). I have the 500 quad switch...I feed 3 receivers..501's. I see where there needs to be 2 lines for the 921 and it would be a major undertaking to run another line through the walls, therefore, can I get a DPP 44 switch and a spliter at the 921 to get it up and working? Will the DPP44 replace the switch that I have now? Should I get a pro to do this or is is simple enough for a MBA ? Any other info would be very much appreciated. Thanks in advance.