I remember at some time in the mid 90's getting a book from my local library where part of the story was a young person, (possibly teens, and I think male), being taught by an elder (maybe human, maybe dragon?), how to transform into a dragon using the blue 'leylines' they can see when they close their eyes and concentrate on them floating above the ground (the lines). this wasn't the main part of the story I think, I think they were having to get to somewhere and he needed to learn this for whatever they were going to. That's all I remember of the book as when I finished it it went back and I started reading other books by Tom Holt and Robert Asprin, and when I wanted to find another book in this Dragon series (if there was one), I couldn't remember who wrote it or what it was called. Can anyone help me out here at all?

I remember at some time in the mid-90's getting a book from my local library where part of the story was a young person, (possibly teens, and I think male), being taught by an elder (maybe human, maybe dragon?), how to transform into a dragon using the blue 'leylines' they can see when they close their eyes and concentrate on them floating above the ground (the lines).

This wasn't the main part of the story I think, I think they were having to get to somewhere and he needed to learn this for whatever they were going to. 

That's all I remember of the book as when I finished it it went back and I started reading other books by Tom Holt and Robert Asprin, and when I wanted to find another book in this Dragon series (if there was one), I couldn't remember who wrote it or what it was called.