I was reading a book and a line I read "if you describe anything with enthusiasm and congruence, people will want to try it."

I keep hearing about congruency, I know definition of it but I am having hard time finding ways to apply it to me.

If I dont have experience with something and I am describing it there is always something that doesn't believe it.

How do one deal with this congruency? Any exercise (self-hypnosys) or resources for it ?