Get bolsters with rubber guards if you are doing it by hand. You WILL miss and smash your hand otherwise. I managed to do so, even with the guard, when taking out the chimney and fire place.
I must admit that I absolutely hate the ones with guards. They just feel mega cumbersome and awkward to use to get into tight spots. Nothing like the risk of injury to focus the mind ;)
Get bolsters with rubber guards if you are doing it by hand. You WILL miss and smash your hand otherwise. I managed to do so, even with the guard, when taking out the chimney and fire place.
https://www.screwfix.com/p/magnusson-guarded-bolster-cold-chisel-set-3-pieces/5429V
An SDS with a chisel bit would be easier though if you can source one.