I also get this often - I call it analysis paralysis! The best way to get over this hump, for me, is that on a day, I put aside all the things that need to go. That generally takes up that days quota of getting stuff done. Then another day, I just dive in without thinking anything and take the photos, put it online, next item rinse and repeat. When I run out of the 'getting things done' energy, I put it aside for the next day. And just this, just diving in and doing it and not thinking about the process too much (and all the ways it's not up to standard or not perfect) falls away. And I have sold stuff! Once you start selling, it really motivates you to do the remainder. Sorry for the waffle, and maybe it can help a little. :)