Stilly, I think you have to choose a specific function for your room if Roger's technique is to succeed. Then you bring in the stuff required for that selected function and put everything else somewhere else. I infer from your previous remarks on this task that, until now, your sunroom has been stash space, and you're trying to change that. If you want to hang out in there yourself, or invite people into it (when you can), then probably most of the stuff currently in it has to leave in order to provide not only the space but also the mood required for sitting and reading or watching telly or just nattering.

Me, I can't relax in a room full of stuff-in-process (such as all that packing material and goods for sale you have mentioned) because I feel guilty for not working on whatever process the stuff was accumulated for. That one characteristic might be what made me a neatnik.

Could you designate the sunroom as work space? Then you could consolidate eBay stuff and sewing stuff in there. But then you would have to find new places for everything that is not related to work ... Crap.