Prior experience with reading origami diagrams is recommended.
There are 3 pages with instructions, containing a total of 26 steps.
The paper size needed for this model is at least 30 cm or 12 inches. The final model is about 1/6th the height of the square you started with.
This model requires thin paper that can take a lot of creases converging at one point. I recommend tissue paper or foil-backed paper.
See also my “Simple Mushroom”.