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My favourite scissors to use are these Fiskars Pruning Snips. They're sharp right to the point at the end, which makes them perfect for doing detailed cuts, and things like fringing. And the fact there are no finger loops makes them much more gentle on your hands, especially if you have alot of petals to cut.
It's always best to keep your scissors sharp, especially if you like to cut multiple layers of paper at a time. I like to use this scissor sharpener from Fiskars.
Most household pliers will work fine for paper flower making. You just need to be able to trim your wires to the right length, and bend the ends to form the head of your paper flowers.
You can also cut your petals using a cutting machine, which is a great option if you have alot of the same petal to make, particularly for smaller or more intricate designs. I have the Cricut Maker, and I highly recommend it for all sorts of craft and paper flower projects.
You'll also need a rotary blade to use with your Cricut Maker to be able to cut crepe paper.