No need to snip or cut worms for your fish. The larger fish will be able to handle the worm without your help. You should buy red wigglers for your smaller fish(4-6 inches).
Now if they are all in the same tank, still give both to the fish. Cut back on the amount of night crawlers until you figure out how many to give.
Good Luck!!! I had the same problem when I was younger. My Dad used to try and get me to rip the worms apart with my fingers for fishing if they were too long or big. I refused.
If I have to do it now, I do it very quickly and precise. I don't like the smell and glue like stuff left on my hands from the worms. The smell still lingers for 2 days, regardless of how much you wash your hands.