I like to use a skil saw and a good blade. Mark how much needs to come off and score a line with a sharp utility knife several times. Cut door with scored side up which will prevent tearout. Cut at or below the scored line to prevent tearout. If you cut above the scored line the veneer will tear out and leave an ugly unstained spot.
Hope this helps, Dave.
Do one thing at a time, do it well, then move on.
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