Georgette,
I don't know your location or how close you are to New Hampshire, but I would suggest you contact David Price to see if he could help you.
http://www.davidpriceflintlocks.com/index.html
David is a true gentleman and has given freely of his knowledge for many years. While he is a gunbuilder, he is also an accomplished engraver. He gives free seminars every year on a variety of subjects at the National Muzzleloading matches in Friendship, IN and has written a number of free tutorials on various subjects. I'm sure a beginning engraving class wouldn't be out of the question for him, and would "probably" be very inexpensive.