Jimmy is right on point. I use his technique for removing small frowns, however, chips, I do bread knife. He is right though, it can be a real pain to start from the flat edge of breadknifing (this is an extreme restoration style though, and I only use it as a last resort to speed up the steel removal). I would suggest watching vids (gssixgun has one on breadknifing) and others on the site about honing out a frown well before attempting this yourself.