2000 Saturn SL2 losing oil

I have been going through a quart of oil every 2-3 weeks. I went to change plugs and wires yesterday, and when I pulled the plug wires I saw oil all over the ens. When I dropped the socket in to pull the plugs, there was about half an inch of oil on the socket when I pulled it out. It appears that the top of the motor is leaking, and the oil is sitting beteen the valve covers (looks like one piece) Do you think it is the valve cover gasket and would this be easy to change? I am not a mechanic, but I am pretty competant mechanically.