Unfold the leading edge folds until they appear as they do in the second photograph.

With those nose folds out of the way, pull the innermost portions forward as shown in the third photograph. Pull the outer edges of these flaps back inward, align them over their own creases and make new creases to keep them in this position. After doing this, fold the flaps back down onto the sheet.

Pull the tip of the nose back toward the trailing edge. Pull the tip of the nose forward again until the diagonal edges reach the rear edges of the leading edge folds as shown in the seventh photograph. After creasing at this point, reverse the fold and tuck the new triangle beneath the flaps as shown in the eighth photograph.

Restoring the existent folds, pull the forward two diagonal flaps backward as shown in the ninth photograph. Pull the portions of these folds that go farther than what is beneath them forward again and crease. After you have done this, unfold the paper as shown in the eleventh photograph. Reverse the folds and tuck them in under the existent leading edge folds. This will complete the leading edges.

Folding the paper in half, cut along the solid diagonal line you made earlier. Retain the piece you cut away.