... you can't write the first chapter. AAAGHHH! It's so frustrating! I've got my outline written, but i can't write the first freakin' chapter! Not even the first page! AGGGGGGGGH!
When an idea you hoped would be a 5000 word short story is now at 10000 words, and your critique group tells you "you're telling a lot. You need to expand this whole chapter into two or three and show more."