The most challenging aspect for me is making sure that I leave my biases at home. I am unable to be successful in any stage of people interactions, if I am lead by my biases.
As Cynthia mentioned, Do not carry your bias.
Another important thing is the negativity. You listen to (most of the time), people who are stressed out, are depressed, are in pain. sometimes this impacts counselors. So do have a personal touch with your subjects/patients, be professional, and follow some meditation practice for yourself.
Jyoti recommends the following next steps: