Depends on whether the pattern calls for garter or stockinette. (yes, I know that’s not really helpful ) But given that you’re doing a pattern, yeah, “knit row / purl row / repeat” would probably be best – that way, when the scarf’s finished, each ‘square’ of the pattern is the same shape and size.
Also, how do you end rows - just twist like the carries?
You won’t be carrying the red yarn with you the whole way. When you’re doing the first row of the pattern, you do black up to the red bit, and then do the red bit, twist the yarns together, and just drop the red, continuing the rest of the row in black. End the row like normal, and go back on the next row; when you get to where the pattern is, the red yarn that you dropped will be close, so you can just pick it up, twist, and do the pattern. When that row’s bit of the pattern is done, you can drop the red again (after twisting) and continue with the black.
(You’ll need to carry the main scarf color, black, through the pattern, since it’s used on both sides and sometimes in the middle, but you don’t need to carry the pattern color, red, through the sides of the scarf.)
Thank you again, I have barely started this project and am already doubting it - LOL
If it makes you feel any better, the second knitting project I ever started was a complicated scarf that had, like, ribbing and cabling and all sorts of tricks. (This was when I was basically [I]learning to knit[/I] still.) …I, er, never quite finished it, and there are about six inches of complicated scarf still sitting in a bag somewhere, so maybe that isn’t the best example to use…