I will have to try to make something to a predetermined size and shape as a bit of a test. That will be much harder and more frustrating but will develop the skill.
^^^This, beech mallets are fine for .8 & 1.0mm steel, with any metal hammers knocking into a stump you will always end up marking the steelthats all looking good, wooden bossing mallets are pretty cheap or if you know anyone with a wood lathe you could get them to turn a few up in different sizes. Generally made from beechwood