If you are using sockets, you often have to grind the face of it flat so that it pushes on the metal rim of the bush, rather than sliding off that and on to the rubber. I second the wedging open of the spring eye whilst your doing it, saves a lot of bashing. In extreme cases when it's well and truly stuck, set it on fire until the rubber melts enough to Bananarama! out, and then use a hammer and chisel to deal with the stuck outer rim.
On a very tight landrover bush I drilled the rubber out and chiselled the outer sleeve. Sometimes they fall out,other times it's a mornings work each one.
Another thing,always clean out the spring eye properly before attempting to insert the new bush,there's often hard flakes of rust in there that will stop or wreck the new bush,and little bit of grease helps for next time you do the job.
1965 Belvedere 2 426 Wedge.
Climate change,global warming,the biggest tax raising scam ever devised by man for mankind.
If you use Blue's method of burning out the rubber, before you break out the hammer another little trick you can try is to pass a junior hacksaw blade through the "eye" and connect it back up to the frame of the hacksaw. You can now carefully cut a slot almost all the way through the outer sleeve of the bush. After you've removed the hacksaw, when you belt it with a hammer the small cross section of metal you left will sheer easily, the outer sleeve will collapse in on itself and the whole lot will drop out.
Whichever method you use, as other folk have mentioned, it's a good idea to clean up the inside with one of those mini flap disks on the end of an electric drill.