So my vest is progressing rather nicely (if I do say so myself). I've got the front done and the back is half-done (but the fun part will be adding the monster face, heehee).
I'm rather enjoying the intarsia now that I know what I'm doing. So here's the low-down to twisting your yarns together: the secret is to lay the "old yarn" over the "new yarn" when you're ready to use the new yarn. Check out the following pictures:
The same thing is done on the wrong side of your work.
The result is a chain-like link running along-side the back of your work.
Now isn't that easy?