The PCV valve on the 4.7 L is easy to swap out and yes you can do it yourself. Its located on the drivers side of the engine bay towards the fire wall on the top of the motor. Not far from the last fuel injector and spark plug. Once you pick up the new PCV valve from the store you will see exactly what it looks like and have no problem locating it on the engine. It does take a huge wrench though to get the old one off and the new one on. I bought a wrench specifically for the PVC valve and cut it down with my angle grinder so I can get in there with it. Its sort of in a tight spot.