Using your other hand to move the paper around will make it easier to cut along the line. Place your paper down and decide which way you are going to fold it You can fold it up the way ...

Cut out with a craft knife or scissors. Measure halfway across the paper at one end and make a pencil mark. At the other end of the paper, place your ruler and measure from that end to the midpoint.

If you are using A4 paper you will probably need to cut up 2 - 3 sheets. You will be folding these over so make sure the strips are chunky. Make sure it is straight by matching up the corners and ...