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Griffin'sPSA's and SGC's are easy, just pry them apart,starting at the top of the flip, furthest from the actual card.
GAI and BGS are tougher, I use a dremel to clip a couple of corners off before prying.
I'd do it in a garage- if you do use something to cut the corners the shards of plastic will fly, and stepping on one hurts worse than stepping on a piece of lego.