I have just had new carpets fitted and the doors wont close. I need to take off the doors and plane the bottoms to ensure they will not scrape on the carpet when closing. Problem is I am having terrible difficulty removing the hinge screws. They have been painted over and I can't budge them. I've tried scoring the heads with a stanley knife etc but the screws wont budge. Any suggestions with the screw removal and the planing?