2 ways off doing this,
1st warm engine at idle to get the heat into the flywheel, once nice and hot turn engine off, put the car in second gear with the clutch pressed (dis-engaged) and with plenty off room turn the engine over on the starter, this may free the clutch. mat take a couple off goes.
2nd, car on ramps, remove flywheel cover and undo the M6 bolts that hold the pressure plate to the flywheel and tap it off, then replace it again [-/