I was a removalist for a few years and I have a few tips.
-If you buy a flat screen tv keep the box, it's better to pack these in the box they came in.
-If you have a filing cabinet empty it, you would be surprised how much a full cabinet weighs especially if you have to use stairs.
-If you pack your own kitchen place any flats (plates,bowls, serving platters) on their sides and put packing on the bottom of the box.
-Don't fill big boxes with books cos they can weigh around 50-80kg.
-Don't use those stupid plastic tubs to fill up with heavy stuff because they break and people have put in claims for a $5 plastic tub even though they filled it with 20kg of books.
-If moving interstate get full insurance and find out exactly what it covers and also check with your own insurance company.
Hope this helps someone.