Replacing the bushes is fairly straight forward, but you need a decent press so it's unlikely to be a home job.

Removal of the ball joint is the first hassle, using a splitter will damage the rubber boot, so we loosened off the nut, then used a hammer and crowbar.
 

 Video here (1.58Mb) It ain't easy!

With the control arms removed, we used a cold chisel to bash the flanges up so we could then press the old bush out.   This is a bashed bush after removal compared to a new one before fitting.
 

To remove and fit the bearings, you need a press, we used this beauty!
 

We used a mixture of huge sockets and bits of pipe to do the job.  Press the old one out, then press the new one in.
 

My bushes were not as bad as most that I have seen pics of, but were still pretty much rooted.  You can see how the rubber has aged and split.
 

With the new bearings fitted to the lower control arms, reinstall the arms to the car then get a full 4 wheel alignment.

The end result was that the car was noticeably smoother to ride in.  The handling improved and the tram-lining was reduced but not eliminated.

Apart from the smoother ride, most of the reduced tram-lining and better handling could also be attributed to the 4-wheel alignment. My bushes hadn't cracked all the way through, so they were still locating the arms to some extent and not causing any noises.

However my car was imported 5 years before I got it, then garaged and just driven on weekends by the retired old dude I bought it from, so generally it is in better condition that any other Soarer that I have seen.   Most peoples bushes will be in a lot worse condition and be contributing significantly to steering, ride and noise problems.

We also replaced the steering rack bushes, added about an hour to the job, fiddly but straight forward once the car is on a hoist

Like most of the bigger jobs on a Soarer, this is a once-off and should help keep the car in top condition for the next 10 years - recommended.