The factory rubber bushes have a bonded crush tube in the middle,
with an outer bonded steel shell.
If they press out, then easy job. I don't have a press so I have always to cut them out.
My proven method...
1. Lock the bracket in a vice to provide stability when cutting/pulling etc.
2. Remove rubber core with a fret saw and coarse blade, giving room for hacksaw blade in next step.
3. Carefully cut a groove into the outer bush shell (but not the bracket itself) to release the interference fit pressure. Two grooves works even better, punching out the bush piece between them. Using a punch/chisel, distort the old shell into the centre void and push the old shell out.
4. Clean inner bracket surface as mentioned above.
5. Use supplied lube on outer faces of poly bush, drawing the bush thru the bracket using a long bolt and big diameter washers either end. It will distort under pressure, then relax back into correct shape once fitted. Assistance with some pushing using something blunt on the leading edge will get it started thru the hole. Keep tightening the draw bolt until the bush pops out the other side.
6. THEN... Fit new crush tube.
This method is proved over 30+ years of doing this type of task. Others may have smarter methods, but it works for me with my limited tools. Works on leaf springs too ! Anything with an eye and a bush.
NOTE: Be mindful of the position of any bolt offset in the OEM bushes when fitted to brackets. Some bushes are available with offset, others without.