Actually most come out fairly easily once the pedal is braced. The problem is that they come off in the same direction that the crank turns freely, limiting the torque you can apply.
One thing to try before you go crazy is to position the pedal at 3 o'clock, and put the pedal wrench back across the crank, past the spindle and lean into it that way. That reduces the tendency of the crank to turn, but you might ask a friend to stand on the pedal for even more stability.
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