The copper is a ductile metal that doesn't need particular or sophisticated machinery to be moulded.
The "ancient method" remains the best method.

We start from the so called mould or from the foil and by using simple tools – from the hammer to anvil and the press – we get the finished product. For some products manual labour is indispensable. For others you can be helped by moulds or presses.
Obviously, the piece of art is not simply created by tools but rather by the artisan's hand.

In this video, Cesare Mazzetti clarifies the point revealing how he managed to coat a pot using silver instead of tin.

.