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. In this blog post, we'll delve into what a letter of instruction is, why it's essential, and how to craft one with finesse and ease.Complete List of Your Assets. This letter of last instruction guide has everything you need to know to create one. We've even included an example for you to reference. A letter of instruction is a document in which you share your final wishes in plain terms. A letter of last instruction is an organized way for you to give your family all the facts about your finances—and have a basic tool for your own. A letter of instruction can complement an estate plan and provide your loved ones with additional details about your assets and wishes after death. Wake Forest University 118B Reynolda Village Winston-Salem, NC 27106. Letters of Recommendation.