Consider that calling these conversations “crucial conversations” or “confrontations” is only scaring you. Instead see that the conversation is an opportunity that is FOR you; you will soon be getting the opportunity to share your feelings and requests with another human.
And, because you’ll be refraining from blame, accusation, criticism and making them wrong, you can take rest knowing that the likelihood of him or her responding back with anger or violence has just decreased dramatically.
Imagine an outcome that would be healthy and fulfilling for the both of you. Create a possibility with him or her, a new “way of being” together going forward. Talk about what’s possible for the relationship.