Very nice!
I feel pretty proud of myself because I just did most of that this past weekend in the process of installing some in ceiling rear surrounds. It was my first attempt - but if you have some competence and follow the advice, it won't be too bad. (Just start early in the am if you live where it is hot!)
I have one question, though. I ran my speaker wires to the same box as my cable so I didn't have to cut another hole in the wall. Is crossing the cable and the speaker wires a problem? Also when looking in the wall, I notice that the speaker wires will cross an electric power cable - - - Are either of these going to cause me a problem with the sound????
By the way, another helpful tool is a small hand mirror to insert into your hole in the wall to determine if there is a board in the middle of your wall and to help find the wires you drop down. Just stick it in there, shine a flashlight on it and turn it until you can see what you want. Works pretty good.
This weekend, I have to finish the install. Since the in ceiling speakers will be right near the external wall, I'll have to squeeze into the space between the ceiling and where the roof slopes to meet the external wall. Ugh.