I've made a few pipes out of red pipestone and it is a fairly easy process to make a simple pipe. My guess is that soap stone would work up the same. Cut the stone into the basic shape with a hack saw or some other fine blade saw. Use a series of rasps and files and sand paper down to 600 or 1200 wet paper grit. Make a stem and you are ready to fire it up. There are more detailed instructions out on the good ol www.