Hey,
Im fixing to install my body lift too... not sure about this weekend as the kit has not arrived via ups yet.
I have installed a pa kit on my 2001 F150 which is very similar.
Definitely use pb blaster a few days prior. Especially on the 2 core supports up front. Even then, chances are that the threads might be rusted and boogered pretty good. I had the passenger core support lock up on me and would not unthread over half way. it stripped and wouldnt screw back on either so I had to take the sawzall and cut the support right in the middle and ruin it to get it out. I couldnt find a junk yard with one so I got one from ford, but that took 4 days.
This is most likely the only issue you "may" encounter.
Having a buddy to help remove bumpers and seats is a good idea too.
Follow the instructions closely and you will be ok.
You can also message me on here or reply to this thread and I will help ya if you have any questions.
Its a good idea later on to ditch the stock fan and go electric fans as moving the radiator shroud 3" WILL cause the truck to overheat in 90+ degree traffic.
Mine did and that sucked when I was pulling my boat in traffic. It seemed as soon as the outside temp hit 91 degrees, the engine temp started to rise.