I just bought another HD TV and want to add another receiver so I can get HD on that TV. I currently only have a 622 running my two TV's. If I buy another HD receiver can I just un hook TV 2 and connect the new receiver to that connection? Also will I still be able to record 2 shows on my 622 with only one TV hooked up? I am trying to figure out if I need to have an installer come back out or is it something I could do myself.