True, the positions will be reversed if we film the dance using the mirrored video, but you can simply only use the mirrored version to learn the moves and then we'll arrange the positions later...
Anyways, I'm learning using an un-mirrored version, since I apparently got the habit of inverting the moves on reflex so using a mirrored version will actually get me going into the wrong directions xD
PS: I thought so too, thanks!