One thing that helped me alot when I changed the plugs on my 97 F-150 was to remove the main power relay. I just disconnected the main wire from the battary terminal block and you can take the bracket bolts out and slide the connectors off. Then you can move it to the engine and you can actually get your hand back in there. I am an engineer, but I would be ashamed if I designed that truck engine placement. Did the same thing on my 98 Navigator with the 5.4 and it was a big help. At least your not trying to get that tiny little screw that hold the coil pack on with the 4.6L. Hope this helps. Changed all my plugs in under 2 hours.