Step 6: Window Hooks
You'll need to take a look at your own windows to see exactly what size of hook you need to make from the two paper clips.
Follow the images to see how I fold a hook with a loop on the end for the string to pass through. Don't forget you'll need two.
The paper clips don't have to be as flashy as mine - ordinary ones work just as well, if you're less stylish than I am.