Advice for a mature student part-time PhD?

Having previously finished my studies at Masters level and after spending a number of years in industry in operational technical roles, I've started doing more research work and found myself underqualified for research positions, having not originally completed a PhD. I'm fortunate that my employer has been able to support a part-time PhD to rectify this - however, as someone coming back into University as a part-time mature student, what change of mindset from my current industrial work approach do I need to be successful in a PhD and in research work?