yea, just pull them off, its easiest to use a vice, but you can use a door too. if your really having trouble, run the grip under hot water first. if its a steel pole, use a pipe cutter to cut it, if its a composite pole, use a hacksaw
I have found that the easiest (and coolest way) to remove pieces from your pole is sword fights. Hitting lift towers, gapers, or other ski poles is the fastest way to get that top off. If you decide to hit a person though keep on skiing and come back the next run to get the missing piece.