My suggestions to use if they work for you:
Play music. It makes time go faster (even when getting cavities drilled... Don't ask how I know)
Grab 3 boxes: junk, donations and homeless items so they don't get handled a million times or clutter where you have already cleaned
Use those new temporary/removeable hooks to hang things like stencils
make a list of goals and a cleaning schedule. Do the room one section at a time.v
make your reorganization as functional as possible.
get rid of decorations that take up space you need for storage.
get rid of stuff that you reasonably believe you will never use and don't feel guilty about it.
post pictures of progress to get encouragement