I love the way Paulo Coelho writes of the act of trying to write, in his book titled The Zahir.

I notice that I go through the same process as I did when writing my first book: I wake up at nine o'clock in the morning, ready to sit down at my computer immediately after breakfast; then I read the newspapers, go for a walk, visit the nearest bar for a chat, come home, look at the computer, discover that I need to make several phone calls, look at the computer again, by which time lunch is ready, and I sit eating and thinking that I really ought to have started writing at eleven o'clock, but now I need a nap, I wake at five in the afternoon, finally turn on the computer, go to check my e-mails, then remember I've destroyed my Internet connection; I could go to a place ten minutes away where I can get online, but couldn't I, just to free my conscience from these feelings of guilt, couldn't I at least write for half an hour?
I begin out of a feeling of duty, but suddenly 'the thing' takes hold of me and I can't stop. The maid calls me for supper and I ask her not to interrupt me; an hour later, she calls me again; I'm hungry, but I must write just one more line, one more sentence, one more page. By the time I sit down at the table, the food is cold, I gobble it down and go back to the computer - I am no longer in control of where I place my feet, the island is being revealed to me, I am being propelled along its paths, finding things I have never even thought or dreamed of. I drink a cup of coffee, and another, and at two o'clock in the morning I finally stop writing, because my eyes are tired.
I go to bed, spend another hour making notes of things to use in the next paragraph and which always prove completely useless - they serve only to empty my mind so that sleep can come. I promise myself that the next morning, I'll start at eleven o'clock prompt. And the following day, the same thing happens - the walk, the conversations, lunch,, a nap, the feelings of guilt, then irritation at myself for destroying the Internet connection, until I, at last, make myself sit down and write the first page ...