The panels are easily cut with any fine toothed saw. You can use a tenon saw, handsaw or jigsaw. Always follow the old carpentry rule: measure twice cut once. If slightly too large the panels can be easily trimmed either with a saw or even a stanley knife. Err on the side of caution when cutting as it is very easy to cut a little bit more off but impossible to add a bit more back on!
A tenon saw will give an accurate cut and a neat finish. The panels cut very easily cut so a cheap tenon saw will do the job perfectly – there is no need to buy an expensive saw if you do not have one already in your tool box.
A handsaw can also be used to cut the wall panels providing the teeth are reasonably fine – coarse saw blades will tend to give a rougher finish and can chip the panels during the cut.
Jigsaws can be used but it is not always easy to cut straight lines with these. Cover the metal plate with some masking tape to ensure it does not scratch the surface of the panels. Choose a fine toothed blade and turn the pendulum motion off (if you have the option). Jigsaw are ideal for cutting curved or detailed areas.
Circular saws and chop saws are not ideal as the blades tend to be too coarse and result in chipped, rough edges.
Hole saws attached to a drill can be used for cutting circular apertures for light fittings, pipes etc.
Make sure you have a large enough work area available when cutting panels preferably with a workbench or flat surface to ensure accurate cutting.