I currently don't have control arms in the car. I need to break out the old upper ball joints from the different control arm I'm putting in.

I've been advised to not just hit the ball joint with the impact wrench, as much as I want to.

Should I bolt them back into the car once I press the two UCA bushings back in and use a breaker bar? Will heating them change things for the worse?

I'm looking for the means that will be the least likely to destroy these.