The way to learn is to do.  I no longer mind sharing my mistakes--it's uphill from here!
   I had quinacrodone gold on hand and used that to paint the metal--too grainy and flat.  I've been asking around and received suggestions for layering various combinations of colors.  I'll also check books and the web for recommendations on painting metal.  I'll paint a page of tools again, soon!
   Also, I used the corner of a cheap brush for the resist (highlights), but the solution thickened and the highlight was too wide.  Someone told me to use a ruling pen--I'll give it a try!  I ran out and bought some inexpensive smaller brushes, and I'll try those, also.  I'll post after experimenting and will report on the results.

Happy painting!