I've used them quite a bit in my classes on "Life as a Dream." Basically, you can write down a troubling life experience - using first person present tense, and including your feelings - as if you are going through it now.
Example: "I wake up in the morning and stub my toe as I get out of bed, really pissing me off. Then I can't find my car keys and feel really frustrated. I find them in the cat box, then discover I'm nearly out of gas. I start to cry. Who hates me up there? I get to the gas station and run into my high school art teacher who has seen my art show. He tells me he saw greatness in me back then. I feel like I'm walking on air. It's like the delays were meant to be."
It's as if you were a three or four different people in a space of a couple of hours: the angry me, the frustrated me, the victim, the artist, the successful me, the divinely-guided me. Now go through the Archetype Cards and pick the ones that most closely match the "beings" you are in this scenario. Read up on them in the booklet. Is there a pattern here? When do the problem inner-archetypes tend to appear? When do the more positive ones appear? Do they need to talk to or support each other? If they were a committee advising you on something now, what would each have to say? Etc.