On 4 July, 01:55, "Spamlet" wrote:

You still need a good hard and smooth anvil of the right curvature to get a
decent finish - and polish the face of the hammers first. *

You don't desperately need either of these for this - work it with a
mallet into a bag. This will also work-harden it adequately, so won't
need a separate planishing step. As it's for outdoor use, not
polishing, there's no need to plansih it for the benefit of the
surface finish. Although you would need hammers for planishing, the
shaping is best done with softer mallets.