I absolutely love Scottish and Irish traditional instrumental music when it's performed well by fantastic musicians. (Quick caveat emptor - I'm talking tunes pretty much totally here. Songs are guid, but not my buzz!) I am one of many wannabes who would love to emulate these folks, and in fact, I have tried to do so, and continue to try. I've even played in a few bands in my time and I know what it's like to feel the energy of a room full of happy dancing people, responding to music you are playing. I've never quite met my own expectations of how a piece of music should sound before I can justify performing it in public. However if I wait for perfection, I'll never play it anywhere outside of my own space. 

So you just have to go for it, and if it's not quite right, persevere, and come back to it and try again, and again. My own technique - play the tunes to yourself so you can sing or whistle them, in your head too, and all the while keep practising them. I'm happy to play sets that others have arranged until I get the tunes, then I can make my own arrangements.

I started a YouTube channel, The Wasted Fiddler, to share my own attempts with the world. Here's a one I recorded playing along with a recording of my Dad and Grandad from the 50's.