Mark the required dimensions on the surface of the sheet using marking tool and straightedge.
Cutting copper sheet with a torch.
For thicker copper sheet you would want to use a jewelry saw it s a bit slower but gives you a nicer finished cutting edge.
Take your time and let the cutter work its way through the copper for a straighter and even cut.
While you can still cut the copper material with the plasma cutter you should not force it and cut too fast.
Work gloves must be worn during the cutting process as the cutting edge of the copper is very sharp.
Cutting your own copper shapes can be easier than you think.
They look like big scissors and work the same way.
For higher gauges meaning thinner copper you can easily do it with standard hardware store metal snips.
Begin cut with metal cutting sheer.
Elevate and support one edge of sheet with free hand allowing entry point for cut enough clearance for metal cutting sheer to proceed.
Once the copper sheet has been marked where it needs to be cut the sheers blades are positioned on each side of the sheet as would be regular scissors when cutting paper.