We have quite a few members here from Oz, hopefully they'll chime in for you.
As others have said, they vary quite a bit. Around here they range from $25 - $55 for trims. Mine charges $45 unless you have quite a few and then he gives a multiple discount and no trip charge. I pay $35 per as I have enough horses to fill up a whole day's schedule for him.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.