Watch the The Water is Wide online guitar lesson by Stephen Bennett from Harp Guitar Basics
I repeat what I said at the beginning of these comments: I don't play tunes precisely the same way time after time. My phrasing and choice of melodic twists and turns is a little different each time I play it. And I encourage you to do the same! Think of it as singing - you like to be able to make subtle changes with your voice - why should the harp guitar be any different?