Info needed:

Attempting to remove FPR for the first time. Before I do this I keep reading/seeing (relieve fuel pressure). How do you do this????? Is this needed before remove the Vacuum line attached to the top of the FPR or even when I attempt to remove the actual FPR? Not sure what will happen.... I am checking to see if GAs is present in the FPR which I have been told may be causing my sons 2001 Buick Regal to stall under 5 MPH or not start most mornings evenings etc.... Thoughts?