Awkward. The lower control arms have to be removed and then once it's all done it needs a wheel alignment. Allow a day to do it if you have never done anything like that before. Have some help if you can, it will make it easier.
It's not so much hard, just time consuming.
I'd allow at least 2 days for the job.
If it is your first time removing the trailing arm assembly, then you will find it difficult. Considering there are two to remove + messing around with bushes (removing/butchering out the old ones) you could run into a few problems.
Having said that, i just finished changing my trailing arm (lower control arm) assembly for the second time and IMO it gets easier each time you do it, be it taking it out or putting it back in. So by the time you are finished the job you would be an expert on this job.
Now i just fitted a trailing arm with 2 nolathane adjustable bushes, so it is now (once again) a 4 point setup.
What i found with that is that it is a bit more tricky. I noticed that my left wheel has a bit of toe in, which i might have to have a crack at straightening up before driving to get the wheel alignment.
So basically what i'm getting at is that the added toe adjustment can make it more complicated than it needs to be for the application. Would i be right in saying that most, if not all people get these solely for the camber correction?
Just one last thing to add. Just as I was about to fit the donor trailing arm i noticed that the handbrake lever was lose/able to be removed. This was one of those problems that set me back a bit. It involved having to figure out how the handbrake assembly works (thankfully through investigation on my old trailing arm) so that i could fix the problem and get on with the job.
So yeah, just thought I'd shed some light on this job to do with trailing arm removal/re-installation and if all goes to plan I will never have to do the job ever again