@Mad_Wed- don't worry too much about the "embellishments" or "ornamentation" just yet. Once you get the basic tune(s) and rhythm down (like the tunes in O'Neill's and Petrie's books), start slow on the tempo, and then add a grace note or two (hammered) here and there where it is indicated, once you feel comfortable playing the basic tune, and then you can build on those. It takes a bit of practice, but you will learn it (: Each player has a different method, anywhere from just hammering a grace note, to two or three quick notes in succession, and some do slides....or a combination of these.  

I do think it helps to listen to recordings or watch videos like the ones above, particularly of tunes you are familiar with, and it seems once you get it, you can apply the technique to other tunes.  

@Everybody- I just posted links to O'Neill's, Petrie's, The Skye Collection and Glen's tune books in Forum>Share in case anyone is interested (:      

Mad_Wed said:

QuicheLoraine, i' ve just started to put my violin on Irish Music way (and fiddle tunes).. now i'm working on "Boil the cabbage.." - double stops, suffle...I also tried triplets.. not very successful yet. But i wonder what is grace (hammered) notes ? I was not lucky on youtube, finding it 

By hammered, I just mean a "pull off" technique, where you can practically hear your fingers tap the fingerboard. I found a good article that explains some of these techniques here. The article mentions also quite a few fiddlers you might look up on YouTube- hopefully you can find good videos showing their left hand (not easy!). Kevin Burke is a good one. He played in the Bothy Band. John Sheahan of the Dubliners, Mairead Ni Mhaonaigh of Altan, Sean Keane of the Chieftains, etc., are others you could find videos of. One of my favorites is Dave Swarbrick of Steeleye Span, a Brit, but a fabulous fiddler. Steeleye Span and Fairport Convention (love them! Esp. their earlier albums.) were English folk rock bands that revived much of the traditional British Isles music, including Scots and Irish tunes- worth mentioning.