This guide is designed to teach you how to write a letter of instruction for heirs, or anyone else who may benefit from a little more direction. Step 1 Fill out the attached Letter of Instruction.•If you are an Individual making the request, please complete Sections 1, 2, and 4 on the next page. Explore the advantages, disadvantages, and steps involved in creating a living trust in Utah. How to Write a Letter of Instruction: Step-by-Step Guide. Start with a Formal Salutation: Address the executor directly. Informal probate is the process for asking the court to appoint a personal representative for a decedent's estate without a hearing. Letters of instruction are a simple and free way to help your family take care of your personal and financial affairs the way you want after you have died. Paired with other estate planning documents (e.g. Certification instructions.