or should i go to a mechanic
can I change the vavle cover gaskets myself on 2002 Mazda Millenia
look at the valve covers, some are held in place with 6 bolts some with 3. Do one at a time keeping the work area very clean. Clean valve cover and have clean hands when putting gasket in. Then, just reverse removal process. If you are unsure see a mechanic. I am assuming your problem is oil showing up around the spark plugs.
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On the Mazda very simple procedure if you are unclear go to autozone.com they have online manuals or automd.com both are very helpful