I want to save money this year by growing flowers from seeds. Some of the seed packets say to "nick" seeds and soak overnight. How do you "nick" seeds? They are so small. Do I use a file, sharp knife, or maybe nail clippers?

I want to save money this year by growing flowers from seeds. Some of the seed packets say to "nick" seeds and soak overnight. How do you "nick" seeds? They are so small. Do I use a file, sharp knife, or maybe nail clippers?