The twitching is typical, like I said. Not in the sense that every time you meditate, from now till forever, you're going to have it. But it's common enough in stage 1. There are also related things that can happen in stage 2, but they're not quite the same. So I'd say that they might be gone by stage 2 and probably will be by stage 3. Your body will get over it eventually. Think of it as your body trying to adapt to doing this new thing; it takes some time to iron the kinks out.

Good luck with your practice! Let us know if anything interesting happens.