there are gaskets. As far as easy, maybe depends on how the hood area is stuffed/laid out. When ti comes down to it, unbolt the bolts, take off the gasket, put on new gasket, polish those dirty covers a bit and chekc the covers to make sure it's physiocally fine and then reinstall the covers and tighten bolts to specifications(alldata or service manual wil lgive you the proper torque specs). You dont realyl need to do the last step since as long as it;s tight and not insainely tight or loose, it'll be fine, but a service manual is useful as hell anyway.
http://www2.lexpartsonline.com/parts/parts...ket+Set&dp=true
you might need other things too.
Remember, anywhere there is a fluid you need to keep in or out, there will be a gasket between metal on metal surfaces.
How much is it leaking, if it's just a very minor leak, it's just wear and tear and you really dont need to replace the gaskets. The car should be fine. If you are losing oil noticibly and need refills between oil changes, that is casue for replacement.