As a trainer, you need to know every skill in your discipline and stay current.  The various discipline committees update their skills and assessment classes on a frequent basis, it pays to review all of the suggested class topics once a year to ensure you know each and every skill.  If anything is unclear, contact an ITE or the discipline chair: List of SEIC Contacts.  All ACA Skills Class outlines are on the following link: ACA Skills Course Outlines.  There is a drop down box and a hyperlink for each discipline.