1) accept that you are going to destroy your shift knob in the process of taking it off the car. I've done it twice - on my current car the knob actually ripped in half all the way through the aluminum threading.
2). Assemble the following: two pipe wrenches, a towel, wire brush, and a friend.
3). Attach wrench #1 to shift knob. Wrap towel around shifter (shaft) and attach wrench #2. Have your friend hold wrench #2 steady so you don't torque the gearbox and go to town on the shift knob. It'll come off. Use wire brush to clean threading on shaft.
Nissan uses a ridiculous amount of loctite on the OEM shift knob for reasons I will never understand - especially considering they sell aftermarket shift knobs.
Hth
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