Narrative is fine -- sometimes the best way to go. I start with a purpose, scope, reference document list, and then the procedure. (I have a title, document number and rev. level, date, and "page X of Y" in the header/footer areas, and a place for approval, reason for revision, and distribution list.)
In the "meat" I try to answer, as applicable, how to do it, who is responsible, what equipment is needed, safety issues, troubleshooting, maintenance issues, control methods, what to do or whom to see if problems/questions arise, what records are needed, what training/certifications is required, and a few other things I am probably forgetting.
Gotta run now, but if you have other questiond please feel free to ask.