Thread 3 straws on a piece of floss about 3 feet long (let gravity help you). You will need 12 of these.
Tie a triangle as tight as you can. You will need 12 of these. The picture shows 2 triangles.
Use the excess floss on the ends to make a pyramid. If there is not enough excess floss, cut small pieces and use that. Be sure that you are tying floss to floss, nothing should be touching the straw. Leave the extra string, you will need it later.
Fold the tissue paper in ¼, trace pattern. Be sure that the fold is where it should be. Cut what you traced.