Using Arduino Uno with Can Bus shield

Hello everyone, i am new to arduino and trying to gather more info about it.

I am working on a project to receive CAN BUS (Controller area network) messages form cars. I am using Sparkfun's CAN BUS Shield and arduino Uno for this purpose. Till now i have downloaded the IDE from arduino site and included CAN bus library from Git hub. shortly i will connect this arrangement to my car to know how it works. Does anyone over here also used this shield or worked on any such project?? please let me know, that would be great help.

I am following this post-

http://www.instructables.com/id/CAN-Bus-Sniffing-and-Broadcasting-with-Arduino/