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How to file for separation
Know who you need.
While any attorney would technically work, you should look to hire a lawyer who specializes in family law. Family law is a field of practice that focuses on marriage, divorce, child custody, and other issues related to the family.
Specifically, you should try and find an attorney who is experienced with separations and divorces. Also, be aware that any attorney you hire will need to be licensed to practice law in the state you will be filing your separation papers.