In this tutorial, we learn how to seam a set-in sleeve into your knit. First, you will need to lay out your piece in front of you and fold the sleeve cap in half. Find the middle point in the sleeve and put a marker in it. After this, attach it to the sweater from three different points. Then, take your needle and hook and start to work it into the middle of the two pieces. Grab the first stitch from the side and then go under to the other side. Grab two 'z' bars to do this and it will come out clean.