How do i crack open psa or beckett cards?

howdy all, i have a few psa and beckett cards graded and i'd rather have them UN-graded. i've searched through posts but have not seen any clear answers how to open these without damaging the cards. i'd sure appreciate any help--i don't have a vice--as one guy suggested. thanks, mark
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I use pliers to crack a corner of a PSA case, then wedge a knife into the crack and turn clockwise. Works great.
Patrick
Collecting:
Brett Favre Master Set
Favre Ticket Stubs
Favre TD Reciever Autos
Football HOF Player/etc. Auto Set
Football HOF Rc's