I want to thank you ALL for your responses. I've been really busy at work, but making progress in my sewing room, too!
I moved a shelf into the closet today, and decluttered a few things from it as well. I have some things that I'll find new homes for, and some things that I'm going to hang onto for a while yet. I gave 2 big bags away, and hopefully by the end of the week, I'll have the room mostly cleared out. Then I can start going through the Rubbermaid containers.