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No worries. We're all here to learn. :)
Not to be nitpicky, but this doesn't appear to be Lidar. Similar functionality using ultrasonics, but not Lidar.
Before you go prying at the plastic covers, a bit of hot glue on a nail or screw head pushed up against the exterior screw covers and then pulled got mine out easily.
If you'd like to just see if it is working before messing with python (and the missing serial module) then you can just run this from to the linux (assuming Rasbian here but should work for others) command line to verify connectivity:cat /dev/ttyACM0This will print out what the Arduino device is sending to the console. Then you can go fight with Python.