Yes Jaybee re weight. I too put the weight on my description for small items such as Batteries and larger items such as blankets as the weight is way over what people would assume it costs and then they say it is "expensive postage". This way they can weigh it themselves.
I also put any overcharged coins in the package with a note explaining why I have returned money to them.I was a buyer for 4.5 years before starting to sell so see it from both sides. However I was not prepared for the reaction and feedback I received when I first sold. My items were free shipping for a couple of months, then I charged half the price of postage to get going. To my surprise I was not left 5 DSR points for postage and I also sent every item the minute it was paid. I had my computer on all day beside me,had $$ of assorted stamps and a post box a few houses down at the top of my street So let's figure that one out.
Going back to an earlier reference I made about sending to places further away yes we can all pick up the brochures regarding postage from any Australia Post Office. Not sure if it is the case in other states but here in Victoria the booklets are no longer to be used so if you are using those they are incorrect.
On these brochures they have a phone number which I used yesterday and I must say 5 STARS to Aust Post.
I had to send a blanket to USA the buyer asked for postage cost so I grabbed the brochure but still not sure(my first o/s buyer)rang the 1800 number for Aust Post. I was put on hold for about 1 minute and then told to leave details and they would make an apppointment to return my call at a time that I said. They DID exactly that and the lady told me the exact postage cost.All I had to tell her was where it was going and the weight. They no longer use dimensions (thank god for that, it is so time consuming).

So to help Victorians out go to the local P.O and get the 3 sheets, pink Aust Postage costs,blue international Postage costs and yellow Express,Courier Reg etc Post.

Sorry I can't help others in Australia but I would assume with the name AUST POST that it is probably the same for you too.