I had the embarrassing squeak in the rear end so had to do the ball joints. Took the opportunity to do the upper control arms at the same time.
I used FEBI and Lemforder
It made a big difference to the camber settings in the rear but as I didn't also do the bushes one side couldn't get back to where I wanted it so both have been set to the same (lesser) setting.
It's prevented me from putting new wheels on as I don't want to chew out a set of tyres before sorting it.
Re the ball joint tool.... with the tool each bush is a 10 min job to get them actually out... without the tool it's next to impossible as there is a rib on one side fouling anything sitting square to pull it out...