If you are about to wash them, I would wait until after they are washed/lanolized/dry again to shave. And then I do it as often as needed thereafter.
I got my shaver at JoAnn's for $7.99. I wish they made a commercial, extra-large capacity, lots-of-horsepower model for me, though, because I shaved all my PFs too and oh man, are they soft!
It's time-consuming but SO worth it. I think I killed the motor on my first shaver, though...they did give me 1/2 credit toward a new one since it died so fast.
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Get one! They are so cool. I don't know how I suffered this long without one!