After first being hired, be ready to have lots of hours. However, after three months, be ready for your hours to start getting slashed. Management, at first, seem to be very supportive of their staff. However, you learn real fast that they will take the word of clients, and act against the employee very quickly. There is no job security here. You will be dropped in a heartbeat, with no looking back, if they think it will appease their clients.
Most patients/clients are amazing
Too many to list.