Parts and tools you need:
New shift knob
arm with hand, must have decent grip
Removing the OEM part:
Grab the stock knob with the grippy hand, and twist it in a counter-clockwise direction. Continue rotation until the knob comes loose.
Installing the aftermarket unit:
Using the key, cut the seal and open the box. Remove the brochure and stickers, then remove the knob and nut. Using the hand again, thread the nut on in a clockwise direction until it is at the bottom of the threaded shifter rod. Now, do the same with the knob. When the knob is just about touching the nut, spin it so that the H-pattern showing is oriented correctly, or to where you want it, and then move it about 15 degrees counter clockwise. Now bring the nut up to the bottom of the knob. Twist the knob into the nut so that they tighten and stop rotating freely. Torque to the spec listed in the manufacturer's supplied spec sheet. Now apply the stickers, preferably to a highly visible location on the exterior of the car.