This is the essential how to guide for low-intensity mental health trainees practitioners and service supervisors who support children and young people with mild-moderate anxiety depression and behavioural difficulties. It provides a manual for practice covering assessment decision-making and key interventions with step-by-step guidance case vignettes and accompanying worksheets to support each evidence-based intervention. It also offers guidance on key service implementation principles supervision and adaptations to practice. It is an ideal resource for those in low-intensity training practitioner or leadership roles looking to develop competency in the low-intensity cognitive behavioural clinical method.