How do couples deal with one wanting to do something while the other doesn’t want to? How do two different personalities get along in the same house?

Be honest.

It’s important to go in the same direction as a couple.

Be accommodating
Be in exchange - give more than you take
Say yes more

Some issues you should not even mention because they will not be important a week later.

If you have a disagreement you may feel like you’re not making progress but when you get it out you may notice the change after a week or so when all that information sinks in, the partner will take it into consideration over time.