If you don't have a dremmel, you can use a pair of pliers to snap off one of the corners of the slab (I usually cut the top right) and then slide a thin piece of metal (like a knife blade) between the two plastic halves.
I, too, am building a '52 Topps set and I buy graded cards when I can find them cheap enough and crack them out as well.
I've found SGC cards to be the easiest, followed by PSA. BGS/BVG are tougher so be careful.
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