It's easy.
If you already have Heli-bars on, then the throttle cable clamp has likely been removed.
Look on the throttle side of the frame, below the front of the gas tank, there will be a small bracket, bolt, or threaded hole visible, which clamped both throttle cables against the frame.
There is no need for it regardless of which bars you have, and it gives you more slack in the cables to remove the bars.
Just remove the allenhead bolt on the inside end of each handlebar, and slide each out of the top plate.
Then you can pull the right handlebar out of the throttle tube.