I hear it's pretty straight forward. Here's a couple of links to read so you know what HDs to use and info on your reciever.
http://www.digitalhome.ca/forum/showthread.php?t=100773
http://www.digitalhome.ca/forum/showthread.php?t=100251
for your last question, it may not be impossible but it won't be easy. Why not just connect your computer to your TV. That's usually pretty straight forward.