I've been able to smell burning oil when I stop my 4runner. So opening the hood I see a light mist of white smoke coming from the back side of the engine. It's not leaking all the way to the ground yet, so I guess that's good. My question is, how hard would it be for me to replace the valve cover gaskets myself and how long should a project like that take? Or should I take it into a garage and have a pofessional do it? I'm not scared to take things apart, I'm just worried about having to readjust thing. Thanks again!