A good rule of thumb for fencing is installation will cost the same as materials.
I have done a bit of contract fencing in my time but now days are mile or so a year around the farm is about it.
Good strainer/stay assemblies are essential for a good fence, put them in first and then run and strain your top barb. Use the strained top barb as the guide for your intermediate posts and your fences will always be straight.
Have around 600y to do sometime in the next few months might do a post on Aussie fencing if anyone is interested.