Besides the great expense of a lawsuit, the demands on your time and emotions can overwhelm you. Explore alternative resolutions. If things get really out of hand, try mediation or arbitration. These are less expensive than going to court and are often less poisonous to relationships. Mediation provides for a neutral party to assist in discussing resolutions, but the result is not binding.
Arbitration typically means both sides to abide by the decision of the arbitrator.
Local better business bureaus frequently offer dispute resolution services. Of course, we'd all like to have our lives and our businesses proceed without any rancor or disagreements. But sooner or later we're going to be arguing with someone or someone is going to be arguing with us. The key is to stay calm and objective, focus on finding positive outcomes, and whatever you do, don't make a federal case out of it.