Have a freakin' sense of humor. That said....
Marriage is a partnership, no one says you have to like each other all the time or agree with each other all the time, if you did you would have married someone exactly like yourself and who in their right mind would want to do that!
Treat your marriage like a partnership, treat each other with respect, kindness and consideration and accept each other's differences and treat each other as equals. You can't solve every problem and sometimes will just have to agree to disagree. Form a united front when dealing with your kids, don't let them manipulate you or play you against one another. Let them know your relationship is as important to you as they are.
I've been married 34 years, it's my second marriage and my DH's first, we haven't agreed on the time of day since we met but we each had all the qualities important to us both and our marriage has lasted. What's that old saying - something worthwhile is never easy.