Tailshaft uni joint replacement

I've got a GQ SWB and while hunting around for a terrible squealing noise when decelerating, I've found one of the uni joints on the tailshaft is completely flogged out. Greasing it up has made the noise dissapear but it still has about 5mm of play.
I'm going to drop the tailshaft and replace both uni joints on the weekend. This is my first time doing uni joints but I've done a bunch of other similar mechanical fixes like wheel bearings and watched a few tutorials online so I'm confident I can do it without too much trouble.
Just wondering if anyone has any pointers or tips specific to patrols worth knowing of beforehand?
Edit: I have the Workshop manual and will be following this.

Youtube brother. Nothing beats watching on how to do it I reckon. But you'll need a vice, and big enough, to install them.