So, that's how you write one user story.
Do just enough. Let the implicit work. Use the explicit to guide and patch it.
I've left out the part where you somehow learn and validate all this stuff you know about the people you're trying to help.
That's very important too, and if you find yourself struggling with any part of who what/how why or unable to come to consensus about given-when-then stuff,
you would probably benefit from talking to and watching more users to fuel your thinking.
fin