They say you don't need any special tools, but you do need a pencil or pen, scissors and something to press the material into the foam. You mention using a butter knife, but I've found a pick to be just the thing for pressing things down. There is enough material to make all the details, but you have to be careful about which parts go where. In addition, the material you will receive is not the same as the photo, but it is similar. It's purple, just not quite like the photo.
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