ROP is still a new thing and few performance metrics are in the public domain but mental resilience and maturity has already been flagged up as an issue. Candidates (male and female) see themselves off early days because they can't cope with being shouted at and keeping their bed space tidy.
Never a truer word's been said. I'd kick myself if I wrapped mentally, not physically or through injury. Live and learn though. Definitely need to get personal admin squared away, and to stick to timings, sleep deprivation and being cold + hungry.