I don't recommend this for a novice wrench. If there's ANY doubt in your mind, don't do it. The Ford Modular engines (4.6, 5.4) have a problem with the heads. Where the spark plugs go in, the material is VERY thing and the spark plug holes strip out very easily. Torque specs and tighten sequence are critical on these heads as well. I also don't recommend EGR delete. They run just fine with them and you won't gain enough performance to warrant the effort. (You'll also have an engine light on constantly.) I think the oil cooler would be easy enough, however. For what it's worth, I've been turning wrenches for 30 years and I won't change spark plugs on any customer's modular engine. (And I just did an engine swap on a 5.4L)