^ To start of course, but sometimes it's to when to start, you have to have expectations for your work, but you cannot rip everything apart. Write. Critizise. Improve. But always first you have to write at all, just thinking doesn't help. And don't throw anything just away, you might be able to use some words later or ideas wich you maybe forget.
< It's 3 am now have to go to sleep
v What's the result for 4 + 4?