Another method that isn't quite as easy but is cheaper and you can do at home is tape the fan to a piece of paper, flip it over, and gently 'scribble' an image of the parts you need. Also eliminates the possibility of any resizing the copier might do (you never know).
Using the screwholes as guides, draw an "X" to locate the center for using a hole-saw (quickest, easiest, cleanest method for beginners, trust me).
Here's an easy guide to drilling holes with a hole-saw (scroll down). Good luck!