not too bad provided you dont try and fit carlton bushes for a firmer ride. Use omega only, just in case you where thinking about it. Carlton dont fit.
Jack car on a stand,or if elite raise the self leveling, place jack under trailing arm to hold in place and give you clearance to work. Remove 3 bolts and larger centre bolt holding triangular plate on. Use a claw hammer or short enough pry bar to lever the bush out. Youll find 3 lips evenly spaced round the bush edge just right for this purpose.
Once removed, youll need to press the new bush in, so gently let the jack down and use it to jack on the new bush placed in the hole. If your jack has a small saddle you may need a block to save damaging the bush. When jacking youll find the bush wont go all the way in, but get it as far in as you can before the car lifts off the stand.
Now the awkward bit. Turn the removed triangular plate upside down, put the large bolt through the centre hole and screw it in through the bush. This should pull the bush in. But, depending how far the bush went in via the jack, the bolt may not reach the captive nut in the chassis. In which case remove the rubber spacer that sits between arm and chassis, the arm will pull down to allow access, and try again, the bolt should now reach, if not jack on the bush so the car lifts off the stand and go have a cup of tea. By the time you come back the car should have sunk down onto the bush enough for the bolt to reach. Remove the jack and wind the bugger in. At this point a windy gun or air ratchet helps but do the last bit by hand as the bolt will now be too long to drive the bush fully home. Now undo the bolt just enough to get a 6 then 8 then 10 mill width allen key to space the arm away from the chassis, then do the bolt up again. Repeat with next thickest allen key until fully home. Then remove the bolt fully, re fit the rubber spacer making sure it fits over the bush correctly and does not get trapped between bush and chassis when you bolt it up. Re fit plate and 4 bolts. Dont know correct torque setting for these.
If you have trouble locating the captive nut with bolt, at an stage and the arm doesnt line up, youll need to lever the trailing arm over to locate the nut in the chassis . I used a cross pain hammer to lever on the arm and near by chassis. Or last resort, and there may well be a very good reason why you should not do this, remove the stand, chock the rear wheel and very carefully reverse up to the chock, pushing the axle forward, hold it on the brake and very firmly apply the hand brake. Should now find the hole lines up but the car will now be on the floor so access will be limited unless you have an elite where the self level will still be raised. Self level defo helps with this job.
Hope that ive explained it clearly enough.