A life coach listens to their clients. They allow their clients the chance to discuss any topic they wish to talk over.
Setting boundaries require both your intuition and your self-management. You might have boundaries, but your client might not. You need to be honest with yourself.
You need to have curiosity. Some clients will be a challenge in getting to the root of the problem. Your curiosity and intuition can help guide you.
Being a life coach is about those you help. You will find some clients take a few sessions and some take longer. You need to have self-management skills with this part.