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Hole saw to cut the rubber and an air chisle to drive them out. If you press them you have to support the inner arch of the arms or you'll bend them and that will wreck them. Others have burnt them out by I don't like option.
You can drill, hammer, and grind them out but the best way is to press them out. I bought a shop press for under $100 at Harbor Freight Tools. It's not the best on the market but it was comparable to others and it paid for itself by the time I was done rebuilding my front and rear suspension.
As gtr said, make sure you support the inside when installing the new bushings or you'll change the shape of the arms and then you'll have lots of problems.
Good luck.
(P.S. I was able to purchase new bushings from the local Chevy dealer. They were better quality than the aftermarket ones I initially bought. It was then that I learned to check GM before buying aftermarket products.)
If you choose to burn them out do it outside, rubber makes some nasty smoke.
It also throws lots of little burning rubber pieces all over the place. Fun to look at IF you are outside. I burned my bushings out in the middle of a big sandy area and the little pieces still set a few leaves on fire.
You can also take a drill with a bit just thinner than the core rubber bushing and drill out the rubber around the circumference.
This is the method I used - no issues.
One thing you might want to consider is where to purchase new ones (if you haven't already). I bought my first set from Ecklers - they varied in size by 35 thousandths of an inch AND the guy that I talked to in their CS dept. thought that was OK .
I bought the second set from VanSteel. They were within 2 thousandths of an inch and went in with no problems.