Those words elicit a groan from any of my knitting students who have accidentally twisted the join on Maria, Gretel or Liesl and realized 2 or 3″ into their knitting that they are making a moebius garment! Here is a really easy way to avoid that painful discovery.
Start with the two-strand CO. Notice how difficult it is to see if the knitting is twisted or not:
Instead of joining immediately, turn and simply work back and forth for the first few rows (what would be rounds). The aforementioned garments each begin with Garter st which is much easier to work flat anyway (knit every row rather than purl a round, knit a round).
After at least one row, join, making sure the RS is facing out and begin working in the round. Even if it is after one row (as in the photo below), you will have more than just a CO edge to help you see whether or not you have twisted your knitting.
You will have to do a tiny bit of seaming to finish but it’s well worth it to avoid an unintended Moebius!