The documents need to be completed and notarized. The Recorder's Office cannot help with filling out your deed.Need a deed to clear up title errors? King County Assignment of Deed of Trust Form. Fill in the blank form formatted to comply with all recording and content requirements. Fill out the amendment form. Complete the entire form. A trust amendment is a legal document that outlines a trustor's revisions to their original trust. For help filling out or filing an Affidavit of Change of Trustee, seek out the services of an experienced probate attorney. From filling out a change of trustee form to delivering notices to interested parties, the process of changing trustees can be complicated.