hi, my apologies for responding late,
1) To convert the car's steering to Electric Power Steering, you will need to replace the complete steering column of your car (from steering wheel assembly to the cross) with the one having EPS motor and control unit on it. And one wire will be installed from the distributor of your car to the eps control unit. Thats it. it will be a bolt to bolt swap..
2) You wont find this equipment brand new, i got it from bilal gunj lahore, it is of JDM Alto.
3) Steering is about 200% lighter now, and it is surely reliable as it will provide assistance according to the speed of the vehicle.
Hope it helps. 
Regards,
Hassan