While any 8 - 9 inch clock should work, I recommend the ReStyle Wall Clock from Target.
It is about $4 and very easy to take apart. Doesn't seem to be available online, but should be at any target store.
Unscrew the clock back, in this case the cardboard it comes in.
There is a little plastic tab that keep the front in.
Push that down and out until the front of the face cover is pushed out far enough grip
Squeeze the exposed face cover together and pop out
With a good amount of force you should be able to pull the second hand directly up and off.
The other hands should be easy to slide of afterwards.
For the most upto date version of the clock face graphic you can check it out from github
git clone git://github.com/fchasen/Tax-Clock-Graphic.git
Or you can download it from here.
If your clock has a face of more than 7.3 inches, you will need to scale the graphic by selecting the clock and pressing option and dragingq the corner.
Print out the graphic on photo glossy paper,
with as high a dpi as you can and
as slowly and high quality as your printer will let you.
Give it a few minutes to dry.
Flip the cover over and use it as a guide to cut around clock face with an x-acto knife.
Cut the center hole using the black circle as a guide. Err on the side of too small, as you won't be able to see the hole with the hands attached anyway.
Re-attach the hands one at a time, making sure that they are level and can move past each other.
Wipe the cover off and place it back into its slot.
Put a battery in and the clock should be all ready.