I'm planning to install a lock into a wooden door and I'll need to cut various holes for the lock body using a chisel. I'll need to use something like a hammer or a mallet to drive the chisel and I'm concerned that using a hammer with a steal head would damage the chisel handle. I've seen a lot of photos where a hammer is used and a chisel handle doesn't look very good there.
So which do I use - a hammer (steal head) or a mallet (rubber head) - for driving a chisel when doing woodwork?