Welcome to Workshop @colin7 and thanks for making your first post. We hope you receive lots of great advice and inspiration for your projects from Workshop community members. Are you working on a pergola?
@colin7 I generally use Straight Snips also try to avoid bending or creasing the sheets as it form a weak point in the polycarbonate, Predrill holes do not punch holes & avoid small tears. Preplan sheet laying for single sheet fixings
Trying to fix ridge capping after you have fixed the sheets can also be challenging as you will be unable to walk on the sheets..