Just before we get started, do make sure that the curtains fit once gathered as a pencil pleat can reduce the width of the curtain by up to half of its width, and the curtains can't be returned if the strings have been pulled.
A curtain that is around the same width as your pole when it is ungathered is best.
If your curtains have visible folds from the packaging, gently iron them, be sure to check out the care label for temperature and guidance on how best to do this.
If you can't iron them don't worry the fold will soon disappear after a while
start by securing all cords at one end of the tape by knotting them together. At the unsecured end hold the loose cords and gently pull them. Push the tape up along the cord, as you go to gather your curtain, you may need to even out the pleats to get a more uniform look. The more evenly you do this the more even the end result will be.
Once you are happy with the look, knot the strings to keep them in place and tuck the leftover cord into the pleat. Don't cut them just in case you need to change the width, and also for easy cleaning later.
Next with the tail end pointing down, attach the curtain hooks at equal distances, ensuring you have an even number on each curtain.
Attach the hooks through the eye of the pole rings, or onto the gliders if you have a track.
For a pencil pleat tease your curtains into position by running your fingers through the fabric to create neat even folds tying a string at the top, middle and bottom leaving for 24 hours, this will keep the fabric falls looking just perfect.