Assembling a computer is quite easy, especially if your friends have some knowledge.
Not to say that static isn't a threat, but it's not as dangerous as people make it out to be, you should take the precautions, but don't worry too much about it. (Unless you're working on a shag rug or the like.).
I would doubt that building a computer, and getting it running will take you more than 2 hours, even for a first timer, as long as you've got some basic knowledge.
A quick google search, turned up these two guides, which from a quick glance, look like they'd be fine for familiarizing you with stuff. (If you can find an old Pentium III machine, taking it apart and reassembleing it might not be a bad idea).
Howstuffworks "How to Build a Computer"
Build Your Own PC
Do you actually live in australia? That will narrow down the list of reputable sites to buy from a lot.
Just as something amusing, once I didn't have a case for a machine I was building, so it ran on my desk like this for a few weeks. (Yes, it was on in this picture).
http://i47.photobucket.com/albums/f1...277/Desk-1.jpg