A lot would depend on the steel.In any case I would advise to mirror polish before hammering.Polish the hammer face,too.Clean the blade well,and hammer on a clean smooth surface.Do as much scale prevention as possible,i e. Turco,foil wrap, whatever.Wire wheel may be a good first cleanup after hardening. Depending on the steel,and the pattern,buff in all directions.Cratex cylinder or bullet wheels should clean up any bad places.If you don't want a bright finish,bead blast the blade.