Air hammer works good, but when all fails and it comes time to drill one of these works great
https://www.ebay.com/itm/7PCS-Self-C...item3b0e6d1622
This tool has changed my whole outlook on drilling out studs in delicate situations. It would be best to replace the drill bit with a quality one to make it work even better. It works so good that I have purchased a few of them and given them to friends that do the same sort of things like I do. And for the price it can't be beat, even when you use it for its intended use of drilling hinge holes!