I would probably watch this video.
Not because you want to solder. But more for back ground. I personally would order the parts because projects change.
This might be helpful. It is for motorcycles but it has signal injection. At worst, some of the values are known.
https://netcult.ch/elmue/hud%20ecu%20hacker/index.php#CAN_Debugger
This is a decent video for can bus explaining what you are seeing. And if you record the file to your pc, then you can analyze or decode it.
