I have known some great fly tiers. One in particular was a perfectionist. He would not use a fly unless it was perfect. One tip he gave me was not to use scissors to cut the thread as it would leave a small tag which could be seen. Instead he used a straight blade of some sort such as an X-acto knife for a clean cut. (This is NOT the tip yet.) So I got an X-acto knife and used it for years. One day I was tying and I reached for some material. As I did something began to roll off my desk. I closed my legs to catch it, and I did. Unfortunately it was the X-acto knife. Four stitches later I was as good as new and a little wiser. Since then I have switched to a cuticle remover to cut thread. It works perfectly and is SAFE.