Easy peasey. Look on eBay for the bush + fitting tool ("Laguna rear bush tool), will be around £100 for two bushes and one tool as a kit. If you (or know someone who) can change brakes you can do the bushes. Forget heat and hammering as there are ABS sensor wires, brake pipes and fuel lines around, with the tool it's an easy:
(1) Jack up the car by the jack point (wheel drops).
(2) Wheel off
(3) unclip wires and pipes near the subframe/body (easy)
(4) 2nd jack under the subframe (supporting only)
(5) undo the four bolts holding the subframe around the bush.
(6) lower the subframe away (lower the 2nd jack).
(Note - the coil spring might drop out, careful!)
(7) use the toll to push out the old bush, clean the hole then use the toll to push in the new bush, easy.
(8) rebuild reverse of stripping and go do the other dise.
2hr job start to finish. Don't forget to check all wires and pipes clipped back in place.
Steve Powell, October 2008