While no one enjoys helping others move, if you ask your family for help well ahead of time then they will be more apt to help you out.
While this may seem like just another thing that’s added to your plate, make copies of all of the keys prior to you move. In all of the chaos of the move it would be easy to lose a key, and that is the last thing you want to deal with on your moving day.
You will need to set up a forwarding address for your mail so that your mail go to your new home. You can do this on the USPS website.