I've done 3 of them on 4.6's
and let me tell you I gave up and took the engine OUT. The drivers side is doable if you remove all the brake stuff, battery tray fuse box and take off the hood, forget the passenger side there's not enough room to lift the head off. The biggest issue is not cleaning the surface or positioning the gasket it's not killing it putting the 60 pound head back on the block and bolting it down.
Trust me it's just easier to have a dealership do it if you have the $$$
($1430 plus 2 days down time)
Never done a V6 or SC that will be later this month I'm sure if Frydaddy keeps at it like he has been.