No. If you're sitting in your wheeliearmchair, and want to move without pushing off anything else, you have to expel something from you at speed, and you'll move in the opposite direction. The example given was for you to hold a tank of compressed air and release the valve. This would work whether you were in your office or floating in space.

Another way of looking at the idea of Newton's law about equal and opposite actions is to imagine yourself on ice skates on an ice rink. Throw a ball as hard as you can without falling over. What will you do? Stay where you are? No, you'll slide slowly in the direction opposite to that in which you threw the ball. Same principle.