If you can get your hands on some snap ring pliers, that makes it much easier to remove the snap ring. Otherwise, a small screwdriver will work to pry out the snap ring. Once its. out, twist the FPR until it pops out. Much like a cork really.
Here are some pictures of the process, its of the supercharged engine, but its the same regulator.
Fuel Pressure regulator (FPR) replacement