Declutter one room without losing a weekend

Help me declutter one room in short sessions.

The room and what's in it: <describe honestly, including the embarrassing categories>
Why it got this way: <one line>
Time I can give: <minutes per session, sessions per week>
What the room is for once it's done: <the function>
Things I know I'm keeping no matter what: <list>
Where "out" things can go: <donate, sell, recycle, bin, someone specific>

Produce:
1. The sequence: sessions of my length, each with one zone or category, ordered so the first session is the easiest visible win.
2. Decision rules, written in advance, for the categories I listed: keep if…, out if…, so I'm not deciding item by item.
3. The maybe box rule: what goes in it, where it lives, and the date I open it (and what happens if I haven't needed anything from it).
4. For each session: what to have ready (bags, boxes, labels), and what to do with the "out" pile before I stop.
5. What NOT to do: the three ways this usually derails (sentimental spirals, organising instead of removing, buying storage first).
6. The finish line: how I'll know the room is done, and the five-minute weekly habit that keeps it that way.

Practical and kind. No minimalism lecture.