I have done many of these. I can tell you that you cannot melt them out unless you have an actual cutting torch.
You can't hammer them out. Impact absorbing rubber remember? The harder you hit, the faster the hammer bounces back at your face.
Utility knives work best at cutting rubber, but you can never get to the rubber so that rarely helps.
A drill will go through rubber pretty easily, but unless you have a drill press, you will most likely grind up the inside of the control arm. If not made perfectly smooth again this will mess up the replacement bushings.
Most places that do suspension work will press them out for $1 each or so.
I pressed some out myself using a large bench vise and some sockets. If you can get it started, you can usually grab it and pull it the rest of the way. You can push a 1" socket all the way into a bushing and have it pop back out. Small sections of black iron pipe from Lowes can help.
The hacksaw blade through the center is great if you can do it. Cut it into 3 or 4 sections and pull them right out. Again, be careful of the outer wall of the control arm.
If the rubber of the bushing extends over the face of the control arm, cut that flange off first, it will slow you down.