So- I am trying to make mickey tie dye shirt for everyone in my party. I followed the directions, watch the youtube video, bought my stuff and proceeded. However, after I stitched around mickey - I CANNOT get the waxed dental floss to pull. I actually ripped one of the shirts trying and the second one was almost impossible! What am I doing wrong? How close do the stitches need to be? I want a really defined mickey head.