Using a permanent marker to make a line on which to cut the metal siding.
How to cut metal building siding.
Measure and mark the desired door opening on the surface of the metal.
A handheld cutting tool fitted with a metal cut off wheel will easily cut through sheet.
This will protect your body from possible metal.
Jigsaws and metal cutting band saws are more work but can make most cuts in light to medium sheet metal.
There will not be any difficulty because you are cutting with the grain of the corrugation and can even use them as guides in some instances.
Step 2 cutting across corrugations.
The marking should be appropriate to the required measurements where the metal should be cut.
Step 1 cutting lengthwise to cut corrugated metal siding lengthwise or with the corrugation you can simply use a set of electric shears to do the job.
Calculate the measurements more than once for accuracy.
I m using irwin to.