Guide for 2011 JBL (non-nav) stereo?

Thanks to this forum I've already figured out that my Sirius XM antenna has basically gone kaput. I can definitely fix this myself but cannot seem to find any manuals or guides to show pictures of how to accomplish this. All the relevant posts mention a connection of the antenna under the driver's seat, but I checked and there appear to only be airbag connectors under there. So it looks like I have to remove the dash (part of it at least) to get to the antenna connection.

I can definitely do this myself but am weary to do so without a technical manual or guide... Does anyone have any resources to help me get started so I don't just start prying off plastic unnecessarily!?!

Thanks in advance!

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