There are a few important things to note about a stereogram. Any planes, whose poles lie upon a great circle, share a zone with any other plane whose pole is on that great circle. For example, in the cubic system, (100), (010), (100) and (010) all lie on the primitive circle. The primitive circle is a special case of a great circle. Therefore, if you are trying to plot the pole of a plane on a stereogram and you know which zone it lies in, the use of a Wulff net will enable you to draw it relatively straightforwardly
When drawing stereographic projections for cubic crystals brackets are not used when defining poles. Hence, the normals to the planes (100), (010), (100) and (010), etc. are written as 100, 010, 100 and 010.
The following animation goes through the basics of using a Wulff net for cubic crystals where the centre of the stereogram is 001.
Note: This animation requires Adobe Flash Player 8 and later, which can be downloaded here.