It's not clear whether the cutout involves cutting the roofing sheets themselves, if it does, walk away. It's your lungs which are at risk from airborne fibres which can be released by rubbing old weathered surfaces on the top or bottom of roofing sheets. If you decide to proceed wear a decent dust mask, and a disposable decorator's overall to save worrying about your suit. White cementitious sheets are much less of a hazard than loose blue asbestos fibres which preceded fibreglass, which is also nasty irritant stuff which lodges in your lungs.
Us older folks have likely had a dose of asbestos anyway. It was used in domestic appliances like toasters, ironing boards and hair driers. Car & train brakes and were full of it, and so the dust at the side of a busy road or in the London underground tunnels were contaminated too. It wasn't banned until 1999.
Anyhow, bee careful!