When changing out the fuel filter, there will be gas ready to fall directly into your eyes, no matter where you are, open sores on your fingers will stingl, you'll get that fantastic taste in the mouth, your nose will sinder like it was sniffing straight sulfur, etc. To add, if it's a FI, the system may be under pressure. Nevermind the dirt you through up there during the off-roading.
Advise you to bleed the pressure if it's injected. There should be a schrader valve up near the intake manifold along the fuel line system. Remove the cap, wrap a towel around it, and push the nipple in to bleed the pressure with a screwdriver point. Then remove the filter, keep a towel over you mouth and nose, have protective glasses on, get a small cup if you want to try to catch some gas coming from the rubber lines (or use an other towel as it won't be much). Then replace it. Simple enough.