Step 1: Prepare and file the following forms (you will need to provide the original and at least one photocopy of each form). For access to Self Help Center form packets visit Complete Forms at Home.The application for letters of administration is Form DE150 submitted with the petition and order for probate at the time the petition is filed with the court. Navigate the estate administration process with Law Offices of Timothy D. Henry. Contact us for compassionate assistance today. In this video, we're going over two forms, DE 140 which is the Order for Probate, and DE 150 which are the Letters, Testamentary, or Letters of Administration. Detailed steps for completing probate on a Will in California, on your own or with an attorney. Exactly what happens in a California Probate Court? Fill out the contact form or call us at (408) 371-6000 to schedule your free consultation. Any case for which all parties do not consent will be reassigned to a District Judge in the San Francisco, Oakland, or San Jose division.