1. be aware of the preconceptions and stereotypes that you are applying to people, including being aware of whether your actions are impacted by these judgements, and
2. pick one of your preconceptions or stereotypes and challenge it during the month.

You could challenge your preconceptions by researching the issue, reading or listening to a source of information that you would not normally consider or getting to know someone who falls into the group that you have the preconception about, so you can understand that they are more than a single story.