Its real easy. Check this out it will walk you through the entire process.
Fog Light replacement (YouTube)
2013 AF 990
2003 F350 6.0L 4X4 DRW, Oil bypass filter, Coolant Filter, Blue Spring fuel pressure mod, DELO ELC, DashBoss Bluetooth engine monitor, EGT/FP gauge, SuperSprings, torklift hitch/tiedowns, 48" SuperTruss, fastguns, Kenwood CMOS Backup Camera.