Kustom has it right. The uppers, if original, will be riveted in. Ues an angle grinder to take the heads off the rivet then center punch them out.
The lowers are pressed in like Kustom said. The removal/installation tool can be rented. Some parts stores may be able to lend you the tool, if you purchase the ball joints from them.
If you can afford it and want to start really fresh, budget in an idler arm, control arm bushings and outer tie rod ends.. You will not believe the difference !!! It's like climbing into a NEW truck.
Val