Olympus Om 10 35mm Camera Help With Manual 35mm Camera?

Help with Manual 35mm Camera? - olympus om 10 35mm camera

For my photo class, we are committed to all our photos with a 35mm camera to take manually, so I am with my mother `s old 35mm Olympus OM2000. It seems that
http://i.testfreaks.com/images/products/600x400/22/olympus-om-2000.525078.jpg
Unfortunately, it is not passed, when I was just curious, has anyone ever used an Olympus OM2000 or intuitive, and it has a countdown? (Something that I can press a button / lever and wait 10-20 seconds before the picture?
I thought I was the little lever on the side of the lens, but I want to before you feel comfortable. Don `t want to ruin my film by chance.