Jim, I'm just a beginner too, but someone on this forum (might have been Sam A) though I don't quite remember, sorry, said to take your scribe and form a very small rounded point on it kind of like a tiny ball ball point but very smooth, so it doesn't scratch but burnishes. It is easy to get rid of the burnished line too. Look at Barry Lee Hand's tutorial were he does the bulino mountain lion and you can see his shiny but not scratched or scribed guide lines.
pappy
Another trick is to find a pen that has a metal tip - a ballpoint - that has run out of ink. If you look around and get a fine lined one it will do the marking without the scratching.
On larger stuff like mugs or wall plaques the ball point pen worked well even with carbon paper. I need some thing finer for the small stuff. I checked out the fourm for B L Hands posts and found his mountian lion. And the burnished layout, am going to try that.