Here's my take on a very realistic HDTV tutorial I found. I added a pretty cool twist at the end. Thanks to BCS for a great tutorial!
Click here to see BCS's detailed tutorial
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My final result:

My TV added to a room:

My steps:
Again, see the full tutorial by BCS here

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Here's how I got it on the wall:
1: I used the Perspective tool to angle the tv.

2. Here's the photo I used for the reflection on the tv.

3. Just drag the photo over the tv roughly where you want it. Lowering the opacity helps to see what you're doing.

4. Delete excess photo from tv.

5. Lower the opacity so it looks natural and erase it where the light shines most on the tv.

6. Here I nudged the reflection that is only on the screen backwards so it doesn't exaclty line up with the reflection that is on the raised surface of the tv itself. Most people might not even notice this, but I thought it was an effective touch. You can notice it on the picture frame at the top, and the table legs at the bottom.

7. Here's the photo I want to add my tv to.

8. Drag the tv in place.

9. I deleted the base of my tv and used the existing one.

10. Here I added a drop shadow behind the tv.

11. I had to adjust the angle so it fits the wall.

12. Finally, I just changed the color of the living room some. I didn't like all that green. I also blacked out the components under the tv to make them match.
