Alright, everyone, repeat after me:
I hereby give myself permission to fuck up when I write.
I will not berate myself for misplaced punctuation, be it comma, period, semicolon or colon. Nor will I whip myself with a cat-o-nine tails for using a semicolon in the first place.
I will pay no attention to the failings of grammar. Sentences shall be allowed to end with prepositions. Neither Grammar Girl nor Nazi shall stay my work.
I will not pay any penance for plot holes. If a MacGuffin is required to move the story along, it shall emerge as from thin air. If a character must do something against his nature, his nature shall change. Forward momentum shall be the rule of the day.
I will show no fear of the beginning, nor the middle, nor the end. The story shall start and stop where I damn well please. If I wish to write the ending first, so be it. I shall jump from scene to scene like a kangaroo on crystal meth if the mood takes me. The tangled snarl of my plot structure shall hold no power over me.
I solemnly reaffirm that I have permission to fuck up when I write...
...so long as I Actually Write...
...and so long as I promise to fix it all in revision.
So let it be written. So let it be done.