Kat, the O'Carolan book I have for mountain dulcimer seems very helpful for fingering melodies; I wonder if it might be a good start for practicing on tunes you already know, to transfer them to dulcimer? It includes notes and, I think, tab, plus chord names. Let me know if you would like to see a page scanned to see if this would be useful, and I will dig it out of the pile.

~S~