yea bro, i was like Osad wtf, but i then realised i was in the same situation when i first tried taking off my oem shift knob it was stiff like a B#$%^, i though i was going to break the stick.lol. so i crossed my fingers and put the gear in second, put my left hand at the bottom of the stick, to hold it tight down in second gear. then with my right hand it took about three to four really hard left turn JERKS!!!, you can’t just twist it off, you have to jerk it in the opening direction really hard to get the thread lose.
its not easy in terms of how tedious it is to get some shift knobs off.