Students that classify as having growth mindsets rather than fixed mindsets enjoy greater academic success. This finding has been repeated in a variety of contexts and encourages teachers and researchers to develop growth mindsets in students. However, neutral and negative conclusions from some mindset intervention studies raise questions about the conditions in which growth mindsets develop. This study contributes evidence and suggestions to guide the development and assessment of growth mindsets in university students. The five-stage behaviour change model provides a framework to explain why mindset interventions may cause shifts that are not detected in the short term. Mindset assessment methods with original and adapted scales are presented and critiqued. I compare literature-sourced experiences used in growth mindset interventions with interview data from seven first-year engineering students at a South African university to help determine if growth mindset interventions for university students are worth implementing. I summarise implications for practice when assessing mindsets or using growth mindset interventions.