Are you referring to the transmission mount or some other bushings? If it's the mount, it's fairly easy to replace - just support the transmission with a floor jack, unbolt the crossmember from the frame, unbolt the mount from the transmission and drop the crossmember out. Install the new transmission mount and reinstall the crossmember.

95 Montero SR
3.8 MIVEC, Advance headers, 2 1/2" exhaust, Magnaflow muffler, OME shocks & rear springs, 2" body lift, 3" tank lift, 4.90s, TRE front locker, factory rear locker, Roger Brown Rock Sliderz, 315/75r16 (35") tires, Sport big brakes