It can be extremely difficult in practice. Kids with reactive attachment disorder will actively attempt to frequently sabotage the relationship to reinforce their belief that these things will always collapse and people will always leave them or abuse them.

In the end the therapy involved usually involves in depth counselling where parents and child will talk about triggers, reactions, and how these things make them feel. Sometimes you will journal your feelings and then review them in therapy and discuss them. In the end it is unfailing dedication and constant bridge building after an incident.

Dialectical behavior therapy also does wonders to help.