do what incasemyheart first said. there are pegs for the pressure plate on the flywheel (3 in all). you can use whatever object you choose (you can get creative) and just wedge it between the peg and the ground, 2x4's, jack handles, should work!!!!
you will need a large breaker bar for the bolts, they are probably slightly rusty + 112 ft/lbs torque
i suggest against putting something in the teeth, everytime i tried that the object i wedged in there would fall out, or the engine would start to lift and rotate onto it.... it sux.