Marking the eye location and lat line (if there is one) can also be good markers.
Like Bob, I also have a large collection of stencils - both flat and formed. I keep them organized on in ziploc bags on alphabetized peghooks (Bass, Bluegill, crappie, craw, etc). Listed on each bag is the model of the blanks they fit. That way I know if I need to cut a new one.
I am not OCD. I just have a very bad memory due to physical and mental ailments.