When you're moving interstate, my best advice is - be organised!
Unless you're a frequent mover, moving house is a great time to have that big clean out you'd never gotten around to. Order in a skip a few weeks before your move and make the decision to discard (or give away, where possible), items you neither need nor use.
When it comes to packing, move through each room systematically - begin with spare rooms / items that aren't used frequently.
Have a color coded sticker system when packing boxes, ie. laundry items - red sticker, master bedroom - blue sticker. Label each box with the name of the room and a brief description of its contents. Always pack boxes so they are full - it means you can stack them without risk of collapse. Clothing, linen and bedding make great fillers for under-filled boxes and will protect more fragile items within.
Photograph cabling set-ups for your electronics, so when you arrive at your new location, you can get set up straight away. Where possible, pack electronic items in their original boxes if you have them otherwise use plenty of packing material and padding, and wrap in blankets, pillows or sheets before placing in boxes - clearly marking as fragile.
On moving day, each person in the household should keep aside a box or two for last minute items that will be needed first when you arrive at your new location. These can contain items such as a set of sheets, basic toiletries and a towel, a change of clothes and PJ's and favorite toys for the kids.
Above all, just remember that moving house is always going to be hard work, but the more organised and prepared you are, the less stressed you will be when you arrive at your new home.