The national HD channels that are on the 129 satellite are also on the 61.5 satellite so, yes, you can put up a single dish for 61.5 (with a DishPro LNB) and connect it to the input of your 1000.2 dish. I would try to find a spot where there is a clear view for 61.5. If not, you are stuck with 129. Your dish pointing screen will tell you where you need to point the dish to get the signal and you don't need to set skew if you use a dish 500 (leave it at 90, no skew).
You won't need to point to 77 or 72.7 since your 1000.2 will be picking up the channels from 119 and 110 and neither the 77 or 72.7 satellites will have the national HD channels.
You won't need to point to 77 or 72.7 since your 1000.2 will be picking up the channels from 119 and 110 and neither the 77 or 72.7 satellites will have the national HD channels.