Lets take a step back here. Before you go off and buy a Matrix, do you know what Ver XBox you have? The Matrix doesnt really care, but it is harder to get it to work on a Ver1.1 vs the 1.0.
You can download the manual on how to install it.
http://www.easybuy2000.com/store/dow...stallation.zip
As for killing your XBox, it could happen. And a bus chould come crashing into my house too... I think if you read the manual and do as it says, you will be fine.