Chip-- you said you are a 2-finger player; this might be a good time to think about adding another finger so you can get a 3-finger roll. This would give you as a backup pattern TIMTIM . . (alternte thumb on 3rd or 4th string with thumb on 5th string) once you've gotten used to that you can start playing melodies, using as the "basic rule" don't play two notes with the SAME finger consecutively. Garry Owen (in G tuning) fell together very well that way, as did some O 'Carolan tunes (Maggie Brown)-- Irish Washerwoman is a little harder as you will find yourself having to cross fingers. . . anyway it CAN be done and it's worth doing! good luck