I crease all the sewing lines first to help make sure I have the right size fabric and it helps remove the paper later. I leave all the papers on until I start joining the blocks to make rows unless there is going to be too much in the seam allowances to sew over. If that happens, I try to just remove the paper in the seam allowance. Cheap tablet or newsprint type paper works best for me. I had some old fashioned type writer paper when I first started and that stuff was perfect but I can't find it any more.