I almost broke my hand trying to remove mine. I have a 13 2LT and it will not budge. Even consulted with a couple of techs at work (I sell Chevy's), and their diagrams show that you have to remove the whole boot assembly to change the knob. Ridiculous!
this is a nightmare... personally I hate the shift knob. What complicates the issue is my cars' manufacture date is 6/12 (2012 1LT- RS clone). I purchased a swanky red shift knob off ebay (yay) when I first bought the car in 11/12. Haven't been able to use it. Has anyone come up an answer to this question?