Advice for replacing upper ball joints and control arm bushings

1970 Duster. Do I need to support the LCA to remove the upper one? I'm trying to avoid loosing a few teeth :oops:
Should I unscrew the ball joint while the UCA is still on the car?
I've seen screw type bushing remover tools advertised, any experience with those?
Should I grease the new bushings when I install them?