Don't get stuck in a your way or my way mindset. Be flexible and willing to compromise. Forget power or jocking for control. Don't force your style on your partner. Agree on terms before you begin collaboration.
Life throws everyone curves at times.
Keep a sense of humor. You can handle anything, if you can laugh about it. Collaboration doesn't work for every author or on every project. Don't be crushed if it doesn't work out. Maybe you were paired with the wrong writer or at the wrong time.