After tying on a new fly when fly fishing, you need to trim the excess string.
As this needs to happen every time, what tool(s) would make the job easier?
You need something that works with a pinching motion and is on a lanyard for easy access.
Fingernail clippers will work, and there are also fishing specific clippers.
Knives would require two hands and scissors like on a multitool need to be opened with both. Clippers on the other hand are easy to work with just one hand.
Why not just use these. Most people hat a set of these with them all the time ;-)