HR20/700 Receiver Installed...upgrading television

Hi all,

Need some guidance. DIRECTV installed HD hardware in my home as part of a change to how they were going to deliver local channels. Currently, I have a SD television connected by composite cables.

I'm upgrading to a 1080i HDTV and was wondering if there is anything beyond the following I need to do to get it working...

1) Take the composite cables out of the loop and use HDMI.

2) Adjust the HDTV settings under Setup to pull the appropriate signal.

3) Unhide the HD Channels in the guide (speaking of which, that choice is "grayed out" for me and currently unavailable. How can I fix that?).

Am I missing anything else?

Thanks in advance!