If you are sewing together blocks try a piece of scotch tape with one end folded over to make an easy tab for removing the tape. when paper piecing or putting together seam binding, i never use pins, they distort the fabric.
a little 2 to 3 inch piece of tape can be used about 10 times before you need another short piece. Don't sew through the tape, place it so the 2 pieces of fabric are held in alignment.