2000 Chevy Malibu

I'm having trouble starting my Malibu. When you turn the key it makes a clicking sound but nothing else happens. I believe it's my starter, but i'm not for sure. It could possibly be the battery or maybe something else. If it is my starter, how do I take it out to replace it without removing other things? It doesn't look like there is enough room to take the starter out. Can anybody help?