Is it really that simple? You tell us...
Actually, it should be. You should be able to hook up your HDMI devices to your AVR, have the AVR play the audio, and have a single HDMI carry the video to your display.
Be Sure to read the Manual, several times if you have to. I've had the same AVR for about 7 years now, and still pull out the manual about once a year.
Listen to the Real HT Info Podcast at
http://realht.info, or on iTunes.
Also, listen right here on The Home Theater Shack. Just use the web applet on the front page.