How do you know what to do? How to be? Is it something that comes naturally? What about talking about your emotions? Did you have to learn how to do that?
Easy?
Hard?
Something you shouldn't worry about or can't really prepare for?
I think you get alot of your general experience when you're young, as you get older, you refine those skills and get better. It's alot of trial and error.
You and your SO have to set those parameters of expectations for each other. Everything doesn't work for everybody, and everybody doesn't want or need the same things out of a relationship with another person.