FWIW, there is PROBABLY a good reason to de-pressurize your fuel system. Personally I've only done it once and found it to be a waste of time and gas spilled. I've done probably 8-10 fuel filters between f-150's, explorers, and expeditions, and have never had a problem with their being too much fuel pressure built up. Just let it sit for a while and get to work! Never dribbled more than a few drops.
Most auto parts carry the tool, it is specifically called the ford fuel line removal tool last I checked.