Use a scrap piece of webbing to test that the hot knife has come up to temperature. The knife should easily melt through the webbing.

Holding the belt tight from both ends, carefully cut on the marked line.

Use a pair of pliers to hold the webbing if the mark is close to the end.

Save or discard the removed webbing responsibly.

Allow the belt to fully cool before handling.

Turn off the hot knife and alert those working nearby that the knife is off but still hot.