NISMORIDER

Hey folks, Im going to replace my lower balljoint today and is there a how-to on this? I read my chiltons but that dont tell me much. Ive replaced my upper ball joint before and that was a breeze..Im replacing my cv axle also and figured since my lower balljoint is shot might as well do them both. I know I read somewhere on here before that I have to loosen up the tension on my bar but do I still have to do that if my upper a arm is already off the frame? Thanks guys