I'm stumped on figuring out what the proper hover state for a step-based navigation workflow should be.
The navigation appears below. There are 3 states. Completed, Active, and Not-Yet-Completed. The user should only be able to navigate back to any of the Completed steps by clicking the text / icon (see screenshot below).
Because the Active and Not-Yet-Completed states are not clickable I am finding it difficult to communicate to the user "hey, you can click on steps you have done to go back and change your work."
Is there any easy way to do this? Is it as simple as changing the cursor to a hand icon once the user hovers over a Completed step? If so, how would they even know that this is possible?

cursor:pointerwon't work for them. – msanford Sep 28 '12 at 15:22