Again he probably has one side jacked up and the other not. And by the sound of it hes using a jack under the control arm but really its putting an upward tension on the bolt, So in order to get the bolt out like that you have to push down on the control arm, not up. Either way, both wheels need to be off the ground so both control arms sag down.
Its not rocket science. You dont need to touch the sway bar or end link at all. Period.