Using these shoes is easy. Just put them on like you would any other pair of shoes. When you want to change the look, swap out the shoelaces between black and red. As for sizing, make sure to check the conversion from Australian to US sizes as mentioned in the product description. For maintenance, since they're made of vegan leather, you can use a soft, damp cloth to wipe them clean. Keep them away from sharp objects to avoid scratches. And remember, this is a pre-order item, so be patient for it to arrive. If there are any issues with the size not being available, we'll get in touch with you right away.