Just make sure to use something clean, you don't want to infect all the plants
with pahtogens.

Maybe you could wipe off a knife (I like to use on of those razors with the
retractable blade), I like to use some rubbing alcohol to kill a bunch of the
bacteria and fungi on it.

Probably just being paranoid, but a freind of mine wiped out his entire orchid
collection because he pruned his plants by just slicing them with his
thumbnail. All infected.