I haven’t taken the plunge to knitting socks with 2 circs or Magic Loop yet. Most of my patterns, done on dpn’s, change needle sizes at least twice, so it it possible to do that with the other methods?
For instance, if the gauge swatch for the sock is a size 4 needle, I cast on with a 6, knit the first few inches of the leg with a 5, then change to a 4 for the rest of the sock.
Looking at the books for the other methods, it looks like it would be very difficult to change needle sizes once you got started. Please let me know if you have done this and how it turned out.