Click the following picture for a full scale image.
Print that image out onto A4 paper, it out maintaining its current dimensions. Don't 'stretch to fit page' or anything fancy like that.
Click for the full size image
Take an empty cereal box. Or empty the contents a full cereal box - this is more important than breakfast.
Cut out a rectangle of cardboard of slightly larger dimensions than the paper.
Take some glue - Pritt Stick will do - and apply it liberally to both the paper and the card.
Stick the paper to the card. Come on, it's not rocket science - why are you even reading this far? You've got the damn image.
Cut around the card to get the outline of the face, once the glue has dried.
You're aiming for something like the picture below, I'd suggest you want wavy lines around the hairline for a realistic effect.
Take a stanley knife, place your mask on top of something solid and dispensible, and then cut out holes for your eyes.
It may be tempting to measure your own eyes, and cut holes appropriately. Don't. Cut holes where my eyes appear - my beauty is more important than your sight.
Once done, you'll want two holes on the edges of the mask (but leave a couple of cm from the edge). These should be fairly small, and just below the eyes.
At this point, most people will want to nail the mask to their own face for the rest of their lives. If you're not one of them, read on.
Take a piece of string, thread it around the back of the mask through the two side holes you've just made.
Place the string around the back of your head, and make sure you've got a tight, but not too tight fit.
Tie each end of the string around itself, creating a knot on the front which can't slip through to the back.
You're now a cheap imitation of the most desirable boy on the planet. In order to try and cope with your new fame and the masses of female attention that will undoubtedly follow, I'd recommend checking http://www.tiedyeina.com for tips.