You would be surprised how many people don't do this. you will find that by having a simply checklist ahead of time will help to ensure that none of the vital stuff is forgotten or overlooked. For instance, transfering utilities, internet, cable and water, are all basics that will make your move much more efficient if you prioritze them ahead of time.
Throw out old stuff that you don't need or let us dispose of it for you. It will be less work for you later down the line. When it comes to moving, less is not more, less is better!
Understand this: No boxes, no moving. You don't want have to stop the process in the middle of moving, using already scarce time and energy to get boxes. Make sure you have plenty of boxes.
All items are not created equal. Depending on your individual situation, you may want to move furniture over early, or you may want to leave furniture for last.
Wrapping paper and heavy-duty tape. Like boxes, you will want to have plenty of this stuff lying around. Heavy-duty tape goes a long way in any move.
Keep markers near so that all of your boxes can be labeled. This will decrease the disorientation that is common on most moves.
This is why it's important to have lots of extra boxes, instead of trying to fit everything you can into one box. It's better to have lots of smaller boxes than a smaller number of larger boxes. A stronger person can always stack the smaller boxes on top of one another to carry larger loads.
It's better to stay organized from beginning to end. So do at least attempt to separate items either by room or by person or by a combination of both. This will simply make everybody's life easier.