Faith in others is usually mistaken for blind faith - observing helplessly only hoping for the best in our heart. We then consciously don't do anything but just hope for the best. In such a situation we subtly experience fear or tension. But this is not true faith nor is the outcome usually right.
Faith in others means to remain alert to what is going on and then to fill the other person with the strength of our faith to such an extent that they feel able to do whatever needs to be done. Our faith will fill them with confidence and they will be able to give their best to the task.