I've used monofilament on three projects and found that using a "metallic/monofilament" needle really helps. My bobbin is also wound with monofilament. I used the Signature transparent size .004 that Joann's carries. As others have said, because it is invisible it's difficult to see whether you have pokey ends sticking up, so I make sure to cut the tails as soon as I'm a few stitches along the row because I'll never find them again.