As a caregiving man, you should strive to project the image of a resolute and unafraid person even if doubt should shake your confidence. Your care-receiver and those around you will know and appreciate your courage.
Make use (i.e. take advantage) of opportunities to gain wisdom. Learn through the experience of others. Especially pay attention to those genuinely interested in your well-being and in caring for your loved one.
Be humble. When death comes too soon you will know peace for having lived to give care.