I'm having some issues with my contour hd and am trying to work on it hence the video.
It would be a good idea to disconnect the battery as well.
It should be fairly easy from the video to figure out what you need. If you push both release clips and the socket will not come off you may need to gently pry up on the bottom of the socket. The contacts may be corroded and not able to release.
I just went back and realized that you can pull the relay and socket out of the rubber boot it sits in without a problem. So if the socket is corroded on you could give that a try as well
Some pics.




Place some dielectric grease on the socket and blades when done.
Hope this helps.