[tei-council] Building (e.g. TEI All schema)

Can someone explain to me like I’m an idiot how to use the Stylesheets to generate, say, a TEI All schema using the Guidelines specs? I’m afraid the documentation doesn’t give me enough to go on. I thought I understood it, but I don’t. My understanding is that you use the transformtei script, but what inputs do you give it? Thanks, Hugh