I used to HATE fair isle...not the finished project, just the process. Over the years, I've tried a whole bunch of different ways...
My first attempts were truly awful...knit to where you change colors, drop one yarn, pick up the other (twisting, of course, so there are no holes!!!), and merrily twisting the balls of yarn into such a tangled mess that overall, more time was spent unwinding and untangling than knitting. Tension was lousy. Too loose in places, puckery in others. I hated fair isle.
Then I took a class, and learned how to hold one color in my right hand, and one in my left hand. A little better. The tangling mess stopped, but tension remained a mystery. Keeping the dominant color dominant also seemed to be a problem, but at the moment I can't quite remember why. It was, though. I still avoided fair-isle most of the time.
And then, I had my AH-HA moment. I was visiting with Beth Brown-Reinsel in her lovely Vermont farmhouse....and between ohhing and ahhhhing over all her antiques and handmades, we pulled out our knitting for awhile. Actually, we probably had the knitting out the whole time, but it took me awhile to stop rubber-necking at her decor, and notice her fair-isle project...and how she was holding both yarns in her right hand. HUH? How are you doing that???
Dominant color goes over your index finger, secondary color goes over 'tall-man'
and your two fingers just flip whatever color you need around the needles. When you need to catch the yarn over long spaces...(long=5 or more stitches usually)...
This is the ONLY way I've ever been able to avoid the puckering, get a decent tension, and not hate fair-isle.
How do you handle fair-isling??? I bet there are even more ways!