Without using PnP I do not know of anyway to get the design on to
your metal in a resist from just a photocopy. Perhaps someone else
has that answer.
Photosopy your deign (or print it with a laser printer) onto an
acetate sheet-- these are sold at office supply stores, or a copy
place like Kinkos can do it for you. Make it as dense as you can.
Put a clothes iron upside-down in a vice so the platen is up. Set it
for cotton or a little above-- you may need to experiment a bit. The
temperature is right if a paper towel left on it about a minute
singes slightly to yellow.
Sand your metal, dust it off and hold it by the edges only, or
pre-etch it for one minute (for silver) then rinse and dry (this
helps hold the image on).
Put the cut-out section of the acetate with your image INK DOWN in
place on your metal, on a paper towel, and use the towel to lift it
onto the iron. Use a tool of your choice to hold everything in place
while you go over the image with a burnisher. When it is hot enough,
the lines become a bit blacker. Burnishing helps to transfer the ink,
but do it lightly, not hard.
When it looks good and black (but before the ink starts to spread
wider), lift it off by lifting the paper towel. I like to put it on a
steel surface to speed cooling.
Lift one corner of the acetate and see whether it transferred well.
If not, lay it back down, heat and burnish again. If so, there should
be very little ink left on the acetate, and a good, dark image on
your metal. You can touch up with extra-fine paint marker, and color
except black so you can see where you’ve worked.
Cover the back with tape, and etch! Been doing it this way for
years. I bought some PnP blue to try, and have never opened it.