there are so many great references out there. When making the Jaw,Boss,and rein transition keep your work so that you do not hammer on the side that was against the anvil. there is a fine line between hammered out and finished. check the edges of the anvil that you are using. Also while you are hammering the Boss out increase your angle from 45 to 60 that will round up that inside corner. I always clean up my boss with a file before final assembly.