ime one common symptom of psychosis is believing you arent delusional. i found this guys framework helpful. it helps avoid the worst case where they dont trust you which is imo why they end up on the streets; everyone that cares about them keeps telling them they are crazy and forcing them to do things instead of accepting and helping them however they want help.

listen (reflectively) - empathize (with how they feel about their experience) - agree (on truth) - partner (to help them accomplish their goals)