Perfect hem line - draw a line on card stock, 1 inch in from edge of card stock. Place the card stock on fabric, with line parallel to fabric edge. Fold fabric over card stock, aligning fabric edge with line; press with an iron.
How to make a tailors seam stick (wooden pressing tool). I do recommend covering the stick with heavyweight preshrunk flannel or felted wool! This helps avoid the show through lines from seam allowances and keeps the fabric on straight of grain.