Yes, you can write a prenup without a lawyer. It isn’t a legal requirement that you have one when writing the agreement, but you should at least hire a lawyer to review the document to ensure it follows your state’s requirements. What is highly recommended for the document to be considered valid in the court’s eyes is for both parties to individually seek legal counsel when negotiating. Otherwise, the court may feel that both parties do not fully understand the terms outlined in the document and decide not to uphold the agreement.