in case someone needs some advise on this here is what i have learnt:
1. Jack the car from the chassis, not the axle. That way, while installing, if the axle moved a bit, you will be able to push it easily with your foot.
2. Replace one radius arm at a time to limit movement on the axle.
3. You will need to torque the bolts on level ground which the car sits on its wheels not jacked.