Taking the photos and keeping them for yourself can help, though! That way, even if you only get a little done, you can look at your "before" and see how much improvement you've made. And when it's all done and time passes, if it falls back into chaos you can look back your photos and think "well, if I did it once, I can do it again!"
Well, as for me, I moved six months ago. I spent about six months prior to that uncluttering! I took carload after carload after carload of old junk to goodwill. @_@ And you know what? Despite all that, I still look around sometimes and ask myself "why do I have all this junk???" It's a lot less, though.
As for cleaning... I need to. But right now I'm sick so I'm just resting and making my boyfriend do all the work.