valve cover gaskets and intake plenum gasket, new EGR O ring - plan one day for your first time. Me about 2-4 hours because I have done that service 100+ times. I usually bench test the fuel injectors and re seal the fuel rail and injector O rings while the intake is off also.
OIl filter adapter can be tricky, sometimes you have to loosen the exhaust Y pipe to get access.
There are 3 O rings in there, plan a few hours
Dipstick tube, 20 minutes to an hour or so the hold down bolt can be tricky because it is mounted with the exhaust stud
O ring deteriorates, can be sealed up with new o ring and silicon
Oil pressure sensor R&R takes minutes with the correct tools, access is from in front of drivers front tire through wheel well, use long extensions and flashlight to remove sensor, clean up the engine block side of things, clean the threads and install new thread sealant, liquid thread sealant (basically liquid teflon) is what I use. re install, DO NOT OVER TIGHTEN the oil pressure sensor is beveled and if you go to far you can crack your 4.0 engine block ask me how I know
With oil leaks first clean the area so you can monitor them, no need to fix something that is not there
A good power wash engine bay and under carriage is the best place to start followed by a visual inspection over the next few drive cycles with a flashlight and rag........ leaks always come from the highest spot, so follow the moisture upward.
The engine fan will blow many fluids rearward.
Fluid always collects and drips from the lowest point
No need to take the truck down for more then a solid day to start attacking these leaks
You can do it! Watch some videos for the upper intake injector re seal I am sure there are plenty out there these days...