I would suggest downloading the OpenOffice pack from here. It's basically like Microsoft Office, but it comes with a program called Draw (and it's free). In it, it's quite simple to use to make pictures smaller without losing clarity.
Once you have the program open, look at the bottom of the screen. There should be a button with a red square, blue triangle, and yellow circle. This opens up a picture from your harddrive (which you have to search for obviously).
When the image is opened on the screen, right-click on the image and select "position and size". In it, you can actually change the size of the image using inches. There's a little check box that says "keep ratio" that you want checked if you want the image to have the same height-to-width ratio as normal when you resize it. Otherwise, if you want it to have a different ratio, then you just unclick the box.
Once that is done, you're ready to print it!