It's absolutely true that having the right attitude is a great help in these jobs. I know from my own experience that choosing a pilot to suit your operation is harder than you might think considering all the CVs you get.
It's hard to define but you know when you see it and if they can fly well (surprisingly not always a given), you've found your pilot. But you can go through a lot of people to get there.
No doubt the successfull candidate for that job will tick all those boxes.