Halekai's description is basically what I would recommend... adding that you really want to use the narrowest, finest toothed circular saw blade to make the majority of the cuts, and then cut the corners using a jig saw with a very fine toothed blade.
One other thing, you will probably want to set the blade depth on the circular saw to just a bit more than the panel thickness, to minimize the damage to any floors or stringers that may be under the opening your cutting.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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