I agree with the poster above. Fairisle isn't difficult so long as you remember your hierarchy of colours.
Main colour needs to sit high and secondary colour(s) below it in order of the pattern.
Most patterns will say Main Colour and then C1, C2 (contrast 1 and contrast 2). So long as you keep C1 below the Main Colour and C2 below C1, you'll avoid getting into a muddle.
Hope this helps?