I did do a LOT of practice with paper and pencil first, until I could draw them fluently, almost with my eyes closed! I'd read all about 'muscle memory' but didn't fully believe it til I tried it! The brain really doesn't seem to know whether it's a pencil or a needle doing the drawing. As I said earlier, I filled an entire A4 pad and got through a few pencils too! This is thanks to Katrine (a friend her in France and also on the board) who does the same - where she leads, I follow! :-D