Fuel filter How-To information.
This one says to remove the fuse, then shows you a picture of where the fuel cutoff switch is, and a representation of the fuel cutoff switch which is behind the passenger kick panel. To unplug you have to remove the kick panel (2 screws), then the unplug the connector from the bottom of the switch. After that, try to start the vehicle twice. It shouldn't start, crank only for a short time. That is all that is needed to discharge the fuel system. http://www.myfordfocus.com/how-to/fuelfilter.htm
I thought we had a better description written by an FF member, but I can't seem to find it. It is a fairly simple procedure- although it might seem daunting at first. Also, if you have any O'Reilleys Auto parts nearby, their Microguard filters come with the correct replacement clips in case you feel like you just have to remove the white clip from the line- you'll have the right one to replace it. Removing the clip will break it 99% of the time.
Do you need a tutorial? Advice? The most important thing is making sure that you jack the vehicle up safely and securely. If the car is a manual transmission, you should purchase some wheel chocks for the front wheels. Bricks are probably ok if you have one in front and one in back of the opposite wheel from where you are jacking the vehicle. It is ok to use the emergency jack for this procedure if you use it correctly.