If you don't have a square sheet of paper, just use a 8.5"x11" regular printer paper. Then fold a square out of it and cut the extra rectangular part.
Just cut that bottom part off after folding the corner. You don't need to draw cutting marks.
A corner to corner fold.
Corner to diagonal fold line both side.
Then it should look like this. Remember that precision is key. It gives you a prettier crane.
Fold all sides within to give you a diamond-like-shape folding at the end.
Just fold those corners over!
Folding the wings.
Folding the tail and neck into place.
Folding a beak.
Standing position and holding it right.