Things You Will Need
Take a few moments to insure a good fit, proper pressure, and execution on each and every screw insertion or removal. Then take a break. Rest a moment. Collect your thoughts. Begin again with renewed vigor.
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Pull the screw out with a pair of vice grips. If enough of the head is exposed, simply twist it and use an alternative screw in place of the damaged one.
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If the screw is flush before it strips, try a drop of penetrating oil or liquid soap or wax. A hard quick blow from a hammer might loosen the damaged screw head.
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Repair the screw head with a small high-speed rotary tool such as a Dremel tool to widen and repair screw slot. Try a little penetrating oil and use an oversized screwdriver that fits the new slot. Use pressure and carefully back out.
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Remove the screw by drilling a small hole through the damaged head, then use the appropriately sized screw extractor such as "Easy Out" to remove the screw.