First time changing spark plugs and coils myself on a 2005 Mazda Tribute 3.0 engine. Not heavy for a tree shadow mechanic with 8 and 10 millimeter long heads. There are also many helpful videos on YouTube. You need a manifold gasket set. I'm not familiar with the other set that comes with it. After doing some research these odd shaped intake manifold gaskets are available below after I removed the fuel rail which I hadn't intended but glad they came as the price for two sets was great. Fast shipping and perfect fit. easy installation