Remember that, sooner or later, before it ever reaches perfection, you will have to let it go and move on and start to write the next thing. Perfection is like chasing the horizon. Keep moving.
Part of my motivation in taking up blogging (again, in earnest this time!) is to get over the idea that writing has to be perfect. What writing should be is frequent. Blogging is a good way to (re)develop a writing habit.