Oh man, I'm excited to hear others' response to this question, because I've also struggled with this. For a while I used "dosido; now walk that same path while looking at your partner" and found it to be... less effective with the beginners than I wanted it to be.
Honestly, sometimes I demo it, especially if there's something interesting that comes after--while it definitely CAN be taught from the mic, sometimes a demo is just clearer.
When teaching it from the mic, I've taken to doing it like this:
1. "This is another of those fancy moves that gets you right back where you started. At the end of this move, you'll be right back here."
2. "So it's important to stay on the side of your set. Lots of people feel like they should cross. Don't."
3. "Lock eyes with your [partner]. You're going to walk a little circle around your [neighbor], while looking at your partner.
4. "[Ravens] take a small step forward, [larks] take a small step back."
5. "Keep your eyes on your partner. Ravens, step to your left and larks step to your right, sliding past your neighbor."
6. "Now larks step forward and ravens step back; larks step right and ravens step left, sliding past your neighbor again."
7. "You're back where you started, hooray! Now let's try that up to speed..." etc.