- Use long strands of yarn instead of bobbins. While I didn't use bobbins to compare techniques, I could see why they would function only to get in the way. Being able to pull the working yarn through the tangled dangle below has proven to be invaluable countless numbers of times.
- Despite what some people think, you can do intarsia-in-the-round, and I would say that it is almost as easy as doing flat intarsia. You also have the added advantage of a much flatter seam, and only a seam where the intarsia work is (instead of down the entire garment).
- You only have to cut strands of yarn for every other color change. I suppose this depends on your project, but this works perfectly for the argyles. They have color progression like this: black, orange, black, blue, black. So the orange and blue are isolated and don't ever need to be cut. You could just leave them on the ball and pull the black ends around them without fear of tangling. Granted, if you had a much more complex intarsia piece, this might not be feasible!
- The technique of the "old" strand going over the "new" strand when you switch colors only seems to make sense half the time. If you're confused, just drop both yarns, lift up the old, and bring the new one under it. I'm not even sure if it makes a difference in these cases, but it is best to be consistent, as this gets you into good habits.
- If you're doing intarsia-in-the-round, counting as you knit helps to make sure you have the right number of stitches. It's easy to forget to increase at the beginning of the round or decrease at the end (or accidentally increase between a stitch which had two yarns - where I was joining up a new strand).
- If part of the pattern looks really delicate or intricate, forget about it for now. Just knit background color and duplicate stitch it in later. The Xs in my argyles will be duplicate stitched when I'm done with the sock.
- Intarsia is slow, so understand this up front and you won't be disappointed in your rate of progress. It does seem to be getting faster now that I've done it for a bit, but I get the feeling that it's still going to be considerably slower than plain old knitting, or even stranded knitting for that matter.
That's all I can think of for now.