Another common mistake is that people do not pack their items carefully. As you pack your boxes you will want to take the extra time to wrap up your fragile items so that they do not get broken during your move. You will also want to pay attention to how heavy you are making your boxes. It really stinks when you did carefully pack a box but the weight of its contents causes the bottom of the box to fall out when it is being moved out.
As you pack you will also want to label your boxes. Many homeowners do not take the time to label their boxes. This makes unpacking a complete nightmare! You have boxes in all sorts of different rooms where they do not belong.