I love knitting with more than one colour! Sometimes stockinette stitch can be boring, but a new colour adds change and even excitement (not hard to make me happy). And it’s so easy to work the stripes.
When I add a new colour, I knit the first stitch with the new yarn (see below).
When I work the second stitch, I use both the new yarn AND its end, so that the new colour is anchored to the knitting in progress.
I continue to do the same with the third stitch. On the fourth stitch, I drop the end and only use the working yarn (that is, the yarn coming from the ball).
Remember to work the two loops as one stitch (you could attach both loops with a safety-pin or split marker to help you remember).
For the fair isle portion, I’m using gadgets from my knitting bag. To keep track of the row I’m working, I use a row counter (helpful only if you remember to change it after every row).
I also use stitch markers to mark off the pattern repeat (which is 20 stitches in this pattern). That way, I can “catch” a mistake quickly and it helps me from getting mixed up.
And don’t forget the many handy-dandy uses of post-it notes! Great for masking off the rows you’re not working on. Once you’re done, move it up to the next row.
Hopefully the fair isle portion goes quickly. Then I can separate the back from the front.