Enrolling in the engraving classes of your choice is the best route AV. Otherwise you are kind of lost in the woods on proper sharpening, techniques and confidence about how to proceed. Acer gave a great class on hammer engraving last year at Ian Pratt's Ohio workshop. As Bama mentioned GRS is certainly on the list, one thing about them is they tend to want to move you into the machine assisted side of engraving, their classes are excellent.
I attended Acer's class last year - I did not come out of it an accomplished engraver, but I learned a great deal in a short time and thoroughly enjoyed the experience. I now have total confidence in shaping a graver, confidence in my approach to hammer engraving and feel I have a solid foundation in it. Getting better is entirely up to me, I have no excuses not to.
dave