URGENT - ball joint

[ov_lozza]

I need someone who has changed a front lower ball joint on a silvia to basically tell me how they did it, im not particularly clued up and not got many tools but have to do it myself.

Is it easier to change the whole arm? Bearing in mind it will be second hand and i wont know the state of the ball joint on it.

Any info would be very helpful as i need to get either a ball joint or arm and do it ASAP.