As you may have noticed, I keep repeating that the edges are sharp. I learned this by slicing my finger. So I decided that I no longer need to worry, I will just sand it. This step is difficult as well.
What you need to do is take a piece of sand paper and fold it. Rubbing along the edge, repeat until smooth. Move to the next side. Do not forget to sand the tips of each flower.
This is tedious but I feel it is a very necessary step.